Yes see another GP. I had this the first time I was pg - very good but rather opinionated GP I went to told me I was at a different time in my life now, and should just get on with it.
He had lost a baby though, not sure if during his wife's pregnancy or through stillbirth
so I tactfully said nothing, and went to a different one in the same practice, who was massively sympathetic and gave me something to try.
I just had the nausea too - a continual fight not to throw up as I thought, once I did I wouldn't be able to stop. It was dreadful.
That was 10 years ago. I had another pregnancy 6 years ago, and was given various things, stemetil (prochlorperazine) and cyclizine. Neither did much but I took them anyway, in case I felt worse without them.
This time (now 30wks) I felt terrible again, up till past 20 weeks, again I managed not to be sick, though I stayed in bed a lot of days. I was met with a totally different attitude from my GP - it's a different surgery - who said, of course, here, have some metoclopramide - it's thought to be safe now.
So I took that, and phenergan (promethazine) and somehow struggled through the first 20 weeks, without losing weight like I did the other two times.
Yes it was still tough but take whatever you can get. You can buy phenergan, it's the usual first stop for a GP when prescribing for morning sickness. If it doesn't work for you, ask for something else.
They're all antihistamines, some people find different ones work better than others. Metoclopramide (maxolon) is the one I prefer - it didn't stop the nausea but I think it can effectively reduce vomiting so was reassuring to take.
Obviously, stop taking meds as soon as you feel able to cope - I took mine till about 15 weeks.
Best of luck, I know how horrid it is xxx