Hi, Castel -
I know how it makes you feel about model building, I'm 79, neuropathy in legs and hands, general clumsiness and pretty severe shakiness. But I've made changes to accomodate for continuing the hobby.
One, I use a small weighted shot bag on the bench, when holding something for such as gluing parts or airbrushing, I lay the back my holding hand on the bag, it conforms instantly to the shape of my hand. That nearly completely removes the shakiness, and I can hold the position as long as needed.
Free hand airbrushing is not easy now, but I took an idea from artists, they will sometimes use a small wooden stick for holding their hands steady when working in an awkward hand/arm position. Mine is sturdy enough to not bend under the weight of my hand and arm, plus I used some rtv on the end for traction at the base, so it can't slip on the bench surface.
It sounds a bit like a rough jury rig, but with some practice and familiarity it provides significant help. I hope you're able to find ways to assist you, it would be really difficult for me to quit the hobby, I'll bet for you as well.
Patrick