If you live where it is legal....try CBD (medical marijuana). Put 5 mg of the extract in a little juice and swig it down...it’ll work within 30 minutes. It’s not addicting,won’t make you feel wonky. Watch the you tube videos on Parkinsons and CBD

I also have hand tremors but maybe not as bad as you do. I find to thread a needle, I loop it and push the loop thru the needle eye. Seems easier than trying to push the end which may or maybe not be frayed. As for sewing on the machine I use feet with a side flange to help me keep it even. I also keep my eye on the fabric at the needle as much as possible as that's where it could go off on you or at least it does for me. I have robotics on my quilt machine as I know my hands will jerk at the wrong time.

this needle threader may seem pricey, but it is the best ever... worth every penny

If your tremor is a "familiar" tremor, or "Essential" tremor, (not Parkinson's) it is genetically inherited and there is medication for it. The essential tremor is faint or absent when the hands are at rest and get worse when you attempt to do something with your hands. (A Parkinson's tremor is the opposite; worst at rest, better when functioning.) The medication for essential tremor is a central nervous system depressant, so any central nervous system depressant will work, including alcoholic beverages. You can also take an herbal supplement called Valerian. Avoid all caffeine, as it makes essential tremors much worse. Essential tremor is what Katharine Hepburn had, but she had it in her head, not her hands (it can occur in either location).

Another vote for the Bohin needle threader. I don't have tremors but am partially blind in one eye so depth perception is a mess. This needle threader works for all sizes needles, I generally use milliners needles and it threads them every time. It does cost a bit more but works so great. I also use one of the Clover threaded needle holders and just thread 10 needles at a time. Good Luck with your issue, don't give up. All kinds of resources to help you.
https://www.amazon.com/Bohin-81980-A...or+hand+sewing

https://www.amazon.com/Clover-625-Do...+needle+holder

Make an appointment with an occupational therapist. They are skilled in working with you to adapt your day to day activities to such difficulties.

What a great idea!! I usually thread 10 at a time, but this makes more sense!

(Oh, I'm talking about hand sewing!)

I have tremors in my left hand, but not interfering with my sewing/quilting. I am hoping it doesn't get worst. Fingers-crossed.

Praying you find a solution to threading your needles, lots of suggestions here.

I just used this in the car yesterday - putting on binding on a road trip.