Thanks for the reply guys. Just being able to make a post like this without feeling like a fool helps a lot.
@gytfunke Some good advice there. I'm a believer in good physical health = good mental health. And my food intake has been crap lately, so what you suggest makes a lot of sense. By eating like I have I've and not working out I've probably lowered my T levels quite a bit, so I'll try focusing on good nutrition and proper hydration again from now.
I workout at home, which can make it a bit hard to keep a good routine, but I'll try starting slowly again and not stress about my performance level right now. I know I can be back in shape within a month or so, if I just start lifting that damn iron ball again. It feels so heavy now compared to what it did before...
I just came back from a run now, luckily I'm running with a colleague of mine, so it's easier to "Just Do It" (TM) when you have an obligation. We usually run about 10 kilometers, so it's not that long. The positive thing about loosing all that weight is that I'm a faster a stronger runner now than I was a few months back, so it's not all bad.

I'd love to to do some TL1CP testing with you guys soon, would be great to see some results of the work that's been put into the project.
@Phanjam Wise words from a wise man. I was apprehensive about posting this, but then I thought f... it! I know the guys here are good guys and they will support me, so I don't care if it's on the internet forever. (Here's looking at you Google)
Like I wrote above, it's not the first time I feel like this and I've been more down than this and bounced back, but when you're down it's hard to look up. There's no need for you guys to worry too much though, I don't have suicidal thoughts or anything like that. (Been there before too) I'm just sick of feeling like this, where there are so many things I want to do, instead of sitting around, feeling sorry for myself.
Guess I'm feeling particularly blue today as I just handed my daughter back to my ex again, after having her with me for a week now. It always pains me to do this since we live so far apart and I don't get to see her that often. I've gotten my Daddy batteries charged a bit now though and that usually helps for a while.
BTW, you don't sound like a self help book, you sound like a goodhearted guy who's been around the block a few times. And haven't you heard, 50 is the new 30, so you're golden.

Thanks again guys. Just reading your replies and feeling that you care helps a lot.

P.S. I won't be beaten!