My dad has recently developed a problem which may be neurological. He will be fine for hours, then suddenly, one hand/arm will start repetitively shaking. Sometimes the onset will seem to coincide with activity, other times not. During this time it's hard to use this hand for much of anything. When this is going on, he also seems to slow/slur his speech, or be at a loss for words (takes a while to get out what he's trying to say), and says he isn't feeling quite right. His head might also be slightly shaking, but it could be from the hand/arm movement. These episodes last anywhere from just a few minutes to an hour or more. Then, he's back to normal.
His heart rate and blood pressure used to always be low, but have recently started going borderline high. He also had a pretty major back injury about a year ago. He fell through a roof and herniated a disc. He refused surgery, and has appeared to improve quite a bit on his own. The shaking seemed to start shortly after he stopped needing the oxycodone, which he wasn't taking for very long. He took a muscle relaxer every morning for 6-8 months or so after his injury, and has recently stopped taking it.
He is the kind of stubborn person who is anti-doctor and probably will not go until he has a real reason to. I just wanted to ask what could possibly be wrong, and what options I could consider making him try if I can't convince him to see a doctor.