I'm so sorry for your condition, and I offer my deepest condolences
As well, I've actually been working on developing a fully-functional (laser, unfortunately) mouse for people with Parkinson's and grip-related conditions. Essentially, it's a fairly thin glove that can be donned normally, with all the parts of a high-end mouse built in. The sensitivity can be adjusted, and it takes intentional effort to click. I'll let you know as development continues.