Even a pharmacist can be a good resource of drug interactions - they work with meds all the time!

I'm inclined to agree with the over-medicated thought. Given the side effects all these can have, you may want to get a second opinion...does this shrink do nothing but push pills?

Has either your GP or psych suggested a sleep study? It's for more than just apnea. If the type of insomnia can be pinned down more exactly, then it's easier to treat.