Jen...I don't know about the candida connection, but all junk food is loaded with msg & heart palpitations is one of the main symptoms. If your not careful you could develope A-Fib like I had. Notice I said 'Had'...which I don't get anymore since I made the msg connection. I used to get these very violent 'jolts' in my chest for a few years. A few months back when I learned about excitatory neurotoxins(msg)& started correcting my diet the heart palpitations & the 'jolts'(A-Fib) came to a stop...what a relief!
May I suggest you go the caveman diet for 2 weeks. I promise you will feel great & if your heart palpitations & other symptoms go away then you have your answer. Are you taking any supplements? Almost all supplements have msg.
If I can be of any more assistence I'll look for your reply here or you can email me.
Hope this helps...Pat Sr