Your mother sounds very toxic and maybe this relationship is not good for you. Maybe that has nothing to do with your neuropathy and a lot to do with your past. She needs to see you as dishonest to absolve her own guilt. Been there, and feel very strongly about it. Toxic mothers, narcissistic mothers, there is a lot of info on the Internet if you want support.

http://narcissists-suck.blogspot.com

Do not be hard on yourself about this. Yes, it is always good to avoid talking about our health, a good rule for anyone. I limit myself to a few minutes a day to vent and I don't always get that in the sense that I often don't feel heard, but it takes time to get used to the new normal and when things are happening, changing quickly for the worse, it is hard to think of much else.