I've become nocturnal against my will?

I've been on multiple sleep medicines. Both prescription and over-the-counter. I sometimes stay up all night and day just to try to sleep the next night only to find myself awake within a few hours in the middle of the night, tossing and turning, completely wide awake. I'm very agravated with this! My social life is suffering. Everyone is asleep when I'm my most energized and vice versa. When people ask me to make plans I always make excuses.. Everyone else sleeps normally (that I socialize with) what is wrong with me? I'm so frustrated with fighting this and getting nowhere. I have fixed my sleep for less than a week or 2 at the most, only to find myself going to bed later and later each night thus returning to sleeping 6am-3pm. My doctor has only told me that I have insomnia.. I'm thinking they're missing something here. Advice?