Survivor since 2012
Boy, it sucks, doesn't it? I'm so sorry you're having to go through this but keep your eye on the prize, even when you feel like you can't lift your head up. This stuff is KILLING those little suckers, each and every one of them! You are stronger than they are. With your will and the chemo working against them, THEY WILL NOT WIN.
Now, for the sleep thing. I also take Trazadone. The dose has varied from 100 to 400 mg a night, depending on how difficult it is for me to sleep. (I'm on Aromasin (Eximestane) now, and it gives me terrible insomnia!) The good thing about Trazadone is that it's not addictive and doesn't give you the weird side effects you can get from other sleep meds like Ambien.
Exercise will also help you. I imagine that's the last thing you can think about, but i figured that just getting up and walking around the house was exercise so I did it and I think it helped!
Best of luck to you!