I went through years of
Depression in my past, and I can definately relate. I was on Effexor from 1996 through November 2006, when I had the urge to go off of it while I was taking Difulcan. I haven't been on it since, and I actually believe that my
Depression was being caused by yeast overgrowth. I strongly suggest that you seek medical help and have a doctor prescribe an antidepressant for you. This is extremely important because during depression, everything seems so dark and hopeless. An antidepressant will help to support your seratonin levels in your brain that regulate mood, which will help tremendously. Since you live in the U.K., this should be doable since the U.K. has a very good health care system.
Another option is to take up an exercise program. I know that an exercise program can sound overwhelming at first when you are truly depressed, but if you could incorporate some exericise in your daily life, it would help increase endorphins in your brain, which act as an antidepressant. Getting a little sun each day (about 30 minutes) will also improve your mood because the increased vitamin D helps with all metabolic functions. Taking fish oil supplements or eating a lot of salmon is also helpful because of the omega-3 in them, but I have found antidepressants and exercise the most helpful.
It might also help if you do what you can to avoid seeing your old girlfriend. I know how this can be. Coincidentally, I just broke up with my boyfriend of one year, and I'm particularly stressed over this. We are trying to be friends, but twice recently, when I've gone to a restaurant that we both like, I've found out that he had left about 10 minutes before I usually arrive after work (and of course, he knows when I would arrive.) This has cut me like a knife. When it happened again last night, a so-called "friend" quipped, "He must have know you were going to get here any minute."
That's when I decided that because of the
Depression that I feel when I learn things like this, I can no longer go to that restaurant or risk running into him. If I let this go on (i.e., putting myself in situations where I might learn things like how he is avoiding me), I feel that ultimately I would continually be dragged down into the abyss of depression. So, it's just best to completely make the break, regardless of how painful it is.
Good luck! Please keep in touch and let us know how you are doing!