Haha I only just now found your post :P I'm going to bump mine to see if I can get any other suggestions cause my doctor won't be in the office until Tuesday so I won't really have him to call...
Yeah I was just about to post this to your question lol
Maybe that's my problem as well. But I've been drinking lots and lots of water especially with lemon cause that's what I've been craving lol.
Sharp vaginal pain is probably your round ligament stretching. Back pain can be helped by maintaining good posture. Nausea is awful. Things that might help: hard candy to suck on, salty things, eating before you even sit up in bed, sweet things, lemon, etc. Unfortunately it's trial and error to find what works best for you to relieve nausea.
Do drink lots of water, and add lemon into it to help absorb as much hydration as possible.