I'm with you on that one, man.
I've been burnt out for as long as I can remember.
Maintaining a perfect 4.0 GPA and working a part-time job at the same time has taken its toll on me. Normally I wouldn't care about the GPA but since I want to get into a good school next year, I've worked hard to keep it. That means I regularly pull all nighters just to make my assignments even "better".
I'm in a persistent state of "go go go". Never had any downtime since last Xmas and that was an extremely stressful time for my family for other reasons, so it wasn't even downtime per se.
Basically I've been working and going to school full-time for the past two years, with no real breaks (I was even doing it during summer). Overall I've been at school for 4 years now--just the last 2 years i had no vacatino time and have been working simultaneously. It kills ya.
Recently my grades have slipped in one class. I'm giving serious thought to dropping it just to save my sanity. I could probably pick up the slack and get the grade up, but at this point its just not worth it--im now "sick" on a regular basis (persistent cold due to lack of sleep and stress). I could take it again next semester and it wouldn't end up affecting my GPA.
My advice to you is just to take an evening (since its the weekend) off. Eat some tasty food, watch your favourite movie and get lots of sleep. Come back and regroup on the weekend to plan out where you want your life to be. Its tough, but I'm confident that you or anyone can direct your life (except, say, determining the health of your loved ones--you can't control that).
Just take it one step at a time and realize there is a light at the end of the tunnel. Maybe you need a job change or to move and get away from where you're at.