extreme sleep problems

hi everyone, I was diagnosed with bipolar II this october after coming out of an extreme depressive state accompanied by a suicide attempt. I first starting exhibiting signs of bipolar this early summer in june when I thought I was experiencing an extreme form of insomnia in which I would be up for days and when I did get sleep it was 1-2 hours and I never felt well rested.

The thing is, even since being medicated my sleep issues keep persisting and I haven't been able to get regular sleep even when not hypomanic or in a depressive state. 

So far, my psychiatrist had prescribed me with lithium(up to 1200mg a day, she just raised it 2 weeks ago in an attempt to help the sleep issue) and 300mg of seroquel at night time but neither of these seem to be doing the trick and allowing me to actually get sleep.

I really feel at a lost and that it will never improve and get better, and my psych doesn’t seem to be of much help and only meets with me for maybe 5 minutes during our meetings and usually just raises the dose by a small amount. but to me, this is severe and its uprooting my entire life, I just want to sleep and feel functional and I absolutely dread night time bc I know I’ll be tossing and turning all night

I’m meeting with my psych again at the end of the week. I guess I’m writing this to see if anyone has any tips on advice or maybe even a medication recommendation for severe sleep issues thats not even being helped by seroquel. also is it okay to ask a psych directly about wanting to try a new medication, I don't know the protocol for this lol

thank you!!