I’m not going through exactly as you but I’ve gone through 82 breast chemo treatments with NO tingling. However 3 weeks ago, cancer moved to brain, 12 spots, and I just finished 10 rounds of brain radiation to whole brain, now I have tingling in finger tips occasionally but my hand does have spasms occasionally. My glucose went from 96 to 130 pretty much overnight and my potassium levels dropped from low, with in levels to just below, overnight. I wonder if the glucose and potassium have anything to do with it? I do take a good, 3rd party tested, potassium supplement and I don’t eat bad glucose but a lot of fruit which shouldn’t effect it because I’ve done the good eating for 3 years. Maybe up potassium, first through Whole Foods and then upping supplements? With chemo every 3 weeks, I get my blood work with each treatment and everything is in the normal range, except now?? Only a MRI will really show brain activity. I’ll keep researching and get with you on any findings. Do the same for me please! May God give you your much needed answers!