I am so sorry that you're experiencing these symptoms - I've experienced them, myself to the point where I was taken to the hospital, by ambulance, because I thought I was having heart attacks. This happened several times.
It sounds as if you are experiencing anxiety disorder - I am NOT a professional, by any stretch of the imagination, but I suffer from this condition, myself, and I have spent years learning to manage it.
From your description, I am guessing that both you and your fiance are living with your mother? Is your father involved in your life, at all? I didn't see any mention of him in your description. You have a new baby? Your first? Is your fiance the father of this child? Any symptoms of post-partum depression? Are you working, at the same time? Going to school?
I would strongly encourage you to actively seek some counseling therapy to find the root of this anxiety, process whatever the events were that contributed, and learn how to manage it. Anxiety can absolutely cause people to think all sorts of things and alter our own beliefs and perceptions about what's going on in the world outside of our heads.
Anxiety also creates an unstoppable vortex of panic. This happens, that happens, the other thing happens, and the anxiety spins into panic, the panic into depression, the depression into more anxiety, and so on.
There are steps that we can take to manage anxiety and learn to calm our minds. This does NOT happen, overnight. This requires time, patience, practice, and courage. And, it's an ongoing thing - it is something that I will be managing for the rest of my life. But, each day isn't as challenging as the previous one. And, when "Life" happens (unexpected catastrophe), I am SO better able to deal with what's going on rather than build stories in my head about what's going to happen down the road.
Also - if the dynamics between you, your mother, your fiance and all three of you, at once, is negative and/or abusive, that, alone, can cause physical symptoms that mimic poisoning or chronic illnesses. I know this from personal experience. People (particularly women) will develop physical symptoms, chronic illneses, acute conditions, and medical diseases if they experience long-term abuse or trauma. So, you're not losing your mind, you're not crazy, and you ARE worthy of getting help for yourself.
Brightest blessings of comfort and encouragement to you.
I am terribly sorry to read of your distress.
First of all, you don't need a psychiatrist. You need a psyCHOLOGIST. Psychiatrists deal in drugs. Psychologists deal in emotional trauma, trust issues, family dysfunction, etc.. and they teach management techniques along with processing traumatic experiences.
Next, you need to understand that psychotropic drugs can often exacerbate symptoms. It is a well documented reaction for patients to experience suicidal ideation with many of these medications. When that happens, patients are encouraged to contact their doctors, immediately, because it can end up with actual attempts at suicide.
I really LIKE the suggestion to use charcoal as an agent to help you make some decisions. Hopefully, the result will be benign and you can focus on yourself and your recovery afterwards.
Next, there is no information on the dynamics of this situation other than a description of your symptoms. What is this person saying? What is this person doing? How are the finances? How often are you seeing your friends? What are YOU doing outside of the walls of this place?
If you read my response, above, I experienced the exact same thing and it's still up in the air about whether or not the ex was poisoning me. I had never, EVER been so physically, emotionally, spiritually, and mentally ill in my lifetime, except when I was in the presence of the ex. I could have gotten a hair follicle test to see if I actually was being poisoned, and I chose to not do this - it wouldn't matter, anyway, because I wouldn't be able to prove it.
Our bodies aren't separate functioning aspects. The brain doesn't function apart from the digestive system, and the digestive system doesn't operate apart from the lymphatic system. We are a whole-being organism, mind, body, and spirit. When we are exposed to traumas and extremely negative and malicious energies, every function within our bodies responds. Some of us develop fibromyalgia (mostly, women). Some of us develop auto-immune disorders, like me - Rheumatoid Arthritis, Psoriatic Arthritis. Some of us develop certain types of cancer - men will often develop prostate or bladder cancer if they experience a sudden trauma, disaster, or loss.
So, this is why I mentioned "psychologist" in lieu of "psychiatrist." And, there's been some excellent information on tumeric and its role in emotional health. A person can take as little as 250mg of tumeric with the same effect as 500mg of tumeric. It doesn't matter how much one takes, but, for some people, can be an outstanding substitute for Prozac.
"Food Is Medicine," is a whole area of study that is devoted to using what already exists all around us to heal and manage our own health and well-being.
Finally, use calming techniques whenever you can. The heart palpitations are typically a symptom of a panic/anxiety attack. They are not life-threatening when they come and go away. I know this from the personal experiences of traveling to the ER via ambulance on several occasions to learn that I was having a full-blown panic attack.
Brightest and most sincere blessings of comfort to you.