Strange problem, need help

Hey /prog/

I have a programming-related problem, and if you guys could help me out, I'd be forever grateful.

I used to program a lot, and made complex stuff without much trouble. For some reason, I stopped programming and thinking about programming and algorithms for a while, almost a year now. Now, I feel that I want to get back to programming and do what I used to do, but for some reason I can't.

I try to read my old source code, but I can't even wrap my head around the hacks and techniques I used before, it just blows right over my head. I try to read about the things I used before, but now I can't even begin to understand those things that seem to have had come so easily before.

I'm scared that I'm getting stupider, /prog/, and that I won't be able to program anymore like I used to. It's not so bad seeing that I regressed, as that is expected if I didn't program for an entire year, but what makes me depressed is that I can't seem to recover from it, that I seem to be stuck in a state of less understanding.

My question is this: Have any of you guys ever had a similar experience/feeling? How did you overcome it and get back to your hobby and passion? I would really appreciate any help you guys have to offer.

Thats a lesson to learn to Document the Code
1.document ALL your code.A Single comment is not sufficient
2.IF you use some hack or optimization, document
2.1.where you got the idea
2.2. whats the algorithm used
2.3. what all parameters mean
2.4. what is different from standard solution
If you follow this, even most nasty code can be deciphered.
I know i've made the same mistake a few times, but i could decipher with difficulty what it was. If you lack the documentation, its going to be like reverse engineering algorithms, slowly deobfuscating them.