I do like art very much, but will come to that in a minute
At the moment I think you may be worrying overmuch in advance about cognitive impairment which admittedly is indeed a frightening matter.
True there may be something there, and I'm sure alcohol would not help anyone, however seeing yourself from the outside you appear very much a person who can converse intelligently, take proactive measures on both your physical and and mental health. Importantly you have love in you.
I'm glad your session with your counsellor helped. Simply being adrift without another perspective can be very confusing and leave one not knowing how to proceed.
Although you may think that I, like your friend, am offering unwanted advice I would like to mention that true, you may be with freinds and come to no physical harm ,however the impetus to drink or not, as you say comes from inside yourself, and I'd feel it a pity if your efforts not to drink were undone out of curiosity as Christmas.
It is horrible to have tremors that stop you working on your art, may I ask if this is something you have talked over with your doctor? I guess maybe you have by your reference to medical marijuana . Was that the only medical alternative offered?
I used to have tremors that affected my ability to write legibly, but they were as a result of stress-induced mental health issues. I was given one medication that helped, however can't offer any more details.
Now in art, and here I'm talking painting, not art in general, then my favorite might be the French Impressionists such as Pierre-Auguste Renoir, though my tastes to very widely, from Roy Lichtenstein and Maurits Escher, though Alphonse Mucha to Johannes Vermeer.
Come to think of it none (except Vermeer) exactly mimic what one can see, always a little something extra there.
What sort of style do you use?