Why am i throwing up for no reason?

Patient: Hi. for the past 8 months or so i have been throwing up every few weeks for no apparent reason. i don’t feel sick and i don’t have a flu. and i feel fine after it happens as well. also, i am not pregnant. i don’t think it’s due to the birth control pill either, as i have been on that for over a year and have had no problems.

Doctor: