My 30 year old boyfriend and I have been together for almost 3 years and lately he can't stay hard no matter what we do. We have tried everything, I mean everything and nothing seems to work. What could be the problem? Which doctor would we have to see about this?

His general doctor would be a start, does he have a lot of stress in his life right now ? Any change in blood pressure or any medication.

After seeing a general practitioner, he should consult a urulogist. If the problem doesn't turn out to be medical/physical, he may want to consider seeing a therapist that specializes in these issues.

It could be due to stress and anxiety. My ex boyfriend had the same issue and it was due to the anti-depressants he was taking.

It could be due to stress and anxiety. My ex boyfriend had the same issue and it was due to the anti-depressants he was taking.Yes. Anti-depressants due tend to decrease one's libido.