Feel so depressed even though I've been changing my lifestyle for the better?

Hi all, I have recently been exercising, eating better, getting out the house way more often, reading, doing more hobbies and trying to get myself back into a functioning member of society. I have been on a high for a while, but I always find my mood fluctuates drastically. I used to sit on my PC all day because I was afraid to leave the house and was depressed with awful social and general anxiety. Now that I'm doing things, I'm wondering why I now feel like doing nothing with a foggy head, not being able to concentrate on anything. 

I feel incredibly fed up and I have no idea why. I have been on fluoxetine for a while and was mixing that with alcohol which I now keep to an absolute minimum (that made me black out and feel awful for days afterwards). So I have cut alcohol out almost completely now and that has been going great. I just don't understand my brain. I feel like my cognitive function is failing along with my memory and many other things. I constantly seem to have a song playing in my head 24/7 and I feel in the clouds for lack of a better phrase. 

I also find if something annoys me, I can go from fine to literally holding in tears very quickly, I can dwell on this for hours upon hours. I also get incredibly paranoid as if the worst possible scenario is the one likely to happen and I will dwell on that. I have no idea if I need to be diagnosed with something, but this just doesn't seem right. I know i have depression, anxiety and social anxiety but I can't help but think theirs more. Now that I'm doing things instead of just sitting in my room, maybe I feel like I should always be doing something? and that is giving me stress because I feel I'm not being productive when I'm not. I'm just very confused and would like some advise. Thanks

Hey, you just bought back some memories with the song thing. I had that for like 3 years until I started on setraline....I and I'm sure many reading this have the same feelings. Good days even weeks then pow...back in the s**t. I found the only release that has long lasting affects is excercise...walking is the best as it lasts the longest. Also allow yourself to feel like this..the more you fight a down period the more anxious you get. It sounds stupid but when I'm having a bad period I know it won't last so I try my best to carry on regardless . Well done staying off the booze cuz that makes things ten times worse. If you really struggle talk to your doctor and perhaps a change of medication may help...I don't know I'm no health professional but they do know best.

And also take some comfort in the fact that you arnt the only one who is going through this.

Take care

Thanks for your reply! I have found that exercise definitely works a treat, but my energy levels are very low for some reason at the moment. You're right with me fighting the down period. I've had a few good weeks and then these feelings come and I worry I'm on a downward spiral again, but that's not always the case I guess. I will try and carry on regardless and see my therapist soon about this stuff, thanks