Severe insomnia after chemo treatment for 32 years

Has anyone else had this, its about drove me crazy,and doctors just say its depression but after 15 different anti depressant mess I still have not been able to sleep more than 1 to 2 hours a night if I sleep at all, keep telling doctors I think the chemo damaged my area of the brain controlling sleep but they still won't help. They have never tried Valium or Xanax on me , those may not work either but I wish they would at least try it. They tried ambien on me could take 2 at a time and not fall asleep. I lost my job and insurance while taking chemo so I was unable to go for follow up with my cancer doctor