I had an autologous stem cell transplant.(my own stem cells). The proceedure was not painful but because (I believe it was) my potassium kept dropping, I kept developing an internal buzzing. It is hard to explain, but I literally had this buzz inside my head that would not go away so they had to hang a potassium drip to stop the problem.
The chemo they have to give you to prepare your body for the transplant is very stong. I had a hard time keeping any food down and I really didn't have any appetite at all for a week. The actual transplant was a breeze. No issues and it was over so quickly.
What the transplant did for me was amazing. Upon blood testing a month or 2 later I had less than 1% myeloma proteins in my blood stream. It is now about 2 years out from my transplant and I still have less than 1%, so I am very happy I had the proceedure.
Good luck to your Mom!