Sleep deprivation and major depression

Ilm finding that when I get a good night's sleep I can handle my depression. I'm currently using Doxepin and Seroquel and Ambien. Seroquel at 200 mg used to get me a good night's sleep but now it's not therapeutic unless I take more than 800 gm. I also need at some future time to get off sleeping pills but I'm not ready for that. I've read about new antidepressants like Vraylo and others. Any other recommendations? If I can find a reasonable clinic who will administer Ketamine, I am ready to try it unless the cost is prohibitive. Psychiatrists' costs are too great unless I can see one about 5 times a year. The only psychiatrist within driving distance requires a prepayment of $600 and I can't afford that. I'd appreciate anyone's comments or optimistic, new recommendations of different medications.