mm, I know exactly what you mean, and I have tried everything you mentioned.

Especially on summer research funding, I do not have to go to school everyday, the only thing I am doing is to stay home, sitting in front of my computer, writing papers. The consequence is my neck, shoulders, thumb, wrists, all got hurt due to improper and lasting sitting position.

This past weekend was tax free weekend and I went shopping for three whole days. When I am sitting in front of my computer today, I feel more refreshed mentally, although tired physically.