I have epilepsy. i had a seizure this morning and i am now throwing up. this has never happened before. should i go to the doctor?

Safest thing: To say is yes. You may have a virus that caused your body enough stress leading to a seizure, but there could be more to it, ie metabolic issues that may gave occurred and the safest thing to do is get checked out by a physician, especially if you are still throwing up. Were you in a safe place? Avoid hitting head? One of the worries would be some form of swelling (rare) leading to increased icp.

Not necessarily: Sometimes a seizure can trigger a migraine and hence result in vomiting. Or you may simply have a virus.