I also recommend getting anti sickness medication. There are quite a few available, so if one doesn't work for you, you could try another one.
With your diet, avoid all fatty foods, cream, butter, spreads, cheese etc at the moment to see if that helps. Change to a 1% milk or skimmed if you can take it. You may find that by not eating fatty foods that the nausea is helped.
I have chronic nausea caused by gall bladder motility dysfunction, so I know how horrible long term nausea is.
For me I wear the anti-sickness travel bands around each wrist..they are sold for travel sickness, but I have found them a real help with the nausea.
Always try and eat something, as having an empty stomach can also make nausea symptoms worse. I find when I am at my worse that dry cereal that I munch on helps too. Frosties are my favourite, as they are sugary and help to keep my energy levels up when the nausea makes eating a problem. Eat small amounts regularly.
Ginger in whatever from you can eat it is a natural antiemetic. I drink a ginger cordial or ginger tea.
Eating dry toast also helps me.
Jellies and any fat free foods are good, although at times I cannot bear the texture of fat free yogurt as my brain still feels it is creamy and makes me feel sick..even though it is fat free.
I am prescribed cyclizine (Valoid), and ondansatron (zofran) from my gp for the nausea which I take regularly. I find if I go a day without taking some sort of medication that my nausea makes it impossible to eat, but if I take the tablets I can eat. The nausea doesn't fully go away for me due to my condition, but tablets and the above suggestions help me to live.
Hope that the dr has some help for you. You can buy Buscopan at a chemist which is good for gall bladder nausea as it helps to make the transit of bile a bit smoother. I find it also helps with pain too in bowel/ gall bladder as my condition causes a slot of pain too.
Good luck, nausea is awful... At least during pregnancy you know there will be an end to it!!...