Is this neuropathy?

I completed AC/T (dose dense) on 5/6/16. During that time, I felt only mild, intermittent tingling in maybe two toes and none that I recall in my hands. Then I underwent 3 weeks of radiation and it didn't seem to change (Not sure it would anyway). My biggest complaint in that regard was a sensation that I had on really thick socks, all the time. In the last few weeks though, things have gotten way worse, and I am not sure why. Other than getting my strength back and becoming more active, I don't think I have done anything to injure or increase the pain I am having in my hands. Every night and sometimes during the day as well, my hands fall asleep so severely that it hurts. At first, I thought it was from laying on my side, laying on my hand, but most of the time now I find myself waking on my back and both hands are stiff and numb. Now I have arthritis like pain in both hands and forearms too constantly. I started taking Tamoxifen in late July. Could that be the cause? And is it neuropathy or something else? I see my MO in a week, but they want to rule out a brain tumor first because of the severe headache I've had for over a month so I am just trying to see what else it hopefully could be to ease my mind and maybe find treatment options other than medications if possible.