Birth control making me sick.

I use to be on the shot but got off because I hate the weight gain. So I asked my doctor what to do because I hate that the pill makes me nauseous. Well he said I will get over that. But how I can't take this. It's only been 4 days. I had a fever the first night with dizzy spells and shaking. Then I just felt like shit the next day and last night I felt like shit and didn't eat much all day and after I took the pill I felt nauseous again and couldn't stop throwing up. Help What can I do to stay on the pill but feel like my old self again ??