I did stem cells where the Hollywood actor got his. It works for Parkinson’s, if you don’t have an underlying issue, like cancer. The company says it will work for 80% of the patients. I have Parkinson’s and rheumatoid arthritis. And my arthritis is almost gone, and I regained my sense of smell, and improved walking among other things.
(FYI: I don’t have tremors and I don’t use Parkinson’s meds)

i think you should speak to your doctor about this. i keep hearing that everyone is different when it comes to PD. is atrial fibrillation the same thing as a-fib? if so, a cousin of ours has that. he has had all kinds of surgery, but he is doing ok now. he didn't have stem cell treatment and he has neuropathy, thanks to agent orange.