What to do?

I am 20 years old and for the last 3 weeks I've been wetting the bed every night. I went to the doctor and all he said that he thought I was sleeping too heavily and gave me some suggestions on what to do. Obviously those haven't been working which is why it has continued to happen so I went to a different doctor who told me there was nothing wrong. Well clearly there is but nothing seems to work and I do not want to use any kind of protection though because I'm self-conscious about my problem. Also I do not want my roommates to find out and I think it would be incredibly hard to keep them from finding out. Any suggestions would be greatly appreciated