I was just browsing questions, wasnt going to answer any (what do i know!) but that does sound pretty odd and i was a bit surprised no one answered your question.
I dont know what would be wrong but you said you didnt want to go to your dad so im guessing youd be in your teens?
If so, a good idea is to go to a youth center doctor (thats what i do). You dont need any cards or parent permission and whatnot. Theyd be able to help you without anyone finding out. Its all confidential.
(: Hope that helps.
x