Hi

I handed in my thesis last week and I bounced around the office for half an hour and then crashed. Its been over a week and a half and I still feel like I have no energy, motivation or enthusiasm for anything.
I'm currently doing a six month placement in a small company and my boss is getting a little fed up of my complete lack of enthusiasm, its not that I'm not doing the work I'm supposed to do, I'm just not as enthusiastic as normal.
Anyway the question in all this is does anyone know how long this feeling usually lasts? I know I've got no good reason to be this fed up but I just can't seem to shake this feeling.