Can't cope with hectic schedule!?

I am currently rehearsing every week night for a play which starts next month. It's amateur, and I am working full time (9.30-6pm) every week day. The rehearsals are supposed to start at 6.30 but often start late, and we are expected to stay until the Directors say so- usually about 9.30. I left at 9 last night because I felt like crap but they weren't very impressed. I'm exhausted all the time, I don't get home til at least 10, and on the weekend I just want to collapse. My boyfriend and my dogs are getting totally neglected- I'm not sure the dogs even know that I still live there!- and I'm too tired to play with them when I got home. I can't drop out of the play this late. What can I do?