I'm in the same boat, I totally feel your pain. School can be ultra stressful, and once you start studying you somewhat get stuck into it if you want work or money. It's a lot of added pressure on something that's already hard enough as it is.
I just entered grad school and I already can't wait to be done. It's not that I don't enjoy the work, but I want to be able to move away and do my own thing for a while without feeling stuck in something.
On the bright side you got a good deal with the paid internship! In what field do you work?