Lacking motivation?

This semester began horribly at best. My car got totaled and I had to go too the hospital, I gained more 20 lbs, and my grades suffered. Now I have lost most of the weight, improved my grades, and gotten a new and better vehicle among other things. The process has been troublesome but worthwhile and I was motivated to do a lot better. However, no I face a new issue. I don't know why but I have lost all motivation and find it almost impossible to study. I have three tough finals in early May and one is 50% of my final grade. Does anyone know of any successful study techniques or something to motivate studying?