Underlying sleepless night problem

Hi, so I’ve have this underlying problem of having nights where I get little to no sleep for a few months now and I have no clue what’s up. I don’t know if it could possibly be insomnia or some other underlying problem that I don’t know about but it really sucks. Recently it has gotten a lot worse to where I am now getting two to three nights without sleep and as you could imagine it is driving me batty. I’ve consulted my regular doctor in the past about it and he doesn’t have a clue on what could be causing it, and my psychiatrist only prescribed me meds to try and help combat it which doesn’t really work. So if someone on here has had similar issues or does have similar issues and knows what it is could you please help?