Should I tell my doctor about this issue?

I have an appointment today it's just a checkup that was just scheduled so I could get forms filled out for college but I do actually have something I am worried about. I am having a hard time getting an erection and maintaining it when I do get one and they never seem to be as hard as they used to be in the past. Is this something I should tell the doctor about even though I am switching to a new doctor after this visit but may not see this new doctor for a while. If you need more details just ask.