Am I doomed? I still think about her and I'm sick
I wouldn't say you're doomed. Why would it make you sick?
When I think of her it always makes me want to throw up
You should move on and not obsess about the past. It is unhealthy to want to throw up when you think of someone.
I'm sure if I really try to get over her then it won't happen anymore
I really think it's worth a shot. I bet the sickness will fade once you've moved on and found someone else.