I think you're suffering from burnout, something I suffer from at least twice a year. The last thing I want to do during this time is sit in front of a computer, even though - like you - my head is full of ideas and projects. It hurts for me to get out of bed, much like depression, I feel worthless like I'm unable to do my job anymore because it pains me too much.

What I do is start running more, once a night/morning, take the dog for a longer walk, go out to the cinema, meet some friends for a pizza or something. Basically taking my mind away from projects whilst getting fresh air, socialising and being active. During this time I tend to get headaches often, but I NEVER take medicines as they seem to make me feel down again. Spending time outside and getting myself fresh air is the best remedy, takes longer, but it's more natural and feels rewarding.

Talking about rewards, another thing that works for me is rewarding myself with mini-achievements. "I'm going to run 3 miles today. And if I do, we'll have a pizza." any reward except computers. After a week or two - depending on how burnt out I am - I feel the urge to get back on a computer and start working again.

I hope the above helps :) It takes a lot of time to find the right remedy for getting yourself through burnout, but time and time again I've read people saying "just get off the computer and out and about" it works, even thought it can be a pain to motivate yourself at first.