I think your GP is wrong not to prescribe you meds.
I was violently sick for just two days before my GP handed over some anti sickness tablets (I do have a heart condition and couldn't keep down ANY water or medication)
I allowed myself to throw up, then quickly took an anti sickness tablet, the first one didn't stay down, but the second one did!! I then defo turned a corner with sickness.
I have stopped the tablets now, and although I feel nauseous I haven't been physically sick since Boxing day (and even then I was just sick after breakfast, and not again)
Sometimes the nausea alone is enough to make you want to curl up and hide!!! Lucky for all those people commenting to you that they didn't get it, next time they get a sickness bug or cold tell them to stop being drama queens and see how they like it!
My sister was not very sympathetic either - she was like "Oh sickness, yeah I didn't get that, how comes you are so sick this time but wasn't with your others?" Err yeah thanks.
OH thankfully has been amazing, this is his first baby so he is keen to make sure I am able to eat and baby is growing!
Please see your GP again, you need support and tell them other horrible bastards to leave you the feck alone, or just cover them in vom 
10+2