Perhaps they can prescribe Ambien for sleep. At least temporarily. I am taking something called Somnapure that I found at Walgreens OTC. It has Lemon Balm, Chamomile Flower Extract, Melatonin, etc so it does have natural herb ingredients. It seems to help me fall asleep. I am plagued with insomnia. Toss and turn about 2 hours every night. But this does seem to help some. Of course......ask your doctor if it's okay to take with your chemo.
Please know that I am thinking about you and praying for you daily. Hope things get better for you.