Loosing weight ?

Teah
Ughhhh. I was 173at my first ob appointment, 165 at my second now I'm 160. The dr keeps telling me to eat  allot of small meals and make sure I'm taking my medicine and I do but it's not working.. I still suffer from extreme nausea at 12w4d. I haven't weighed anything less then 163 since 8th grade!!! Anyone have any advise on packing on the pounds.? Or dealing with nausea & vommiting. I take zofran and it keeps me out of the hospital but I still have a hard time keeping most foods down.