Your symptoms are very similar to mine. Tension and muscle contrations in my forarm and my wrist tends to snap forward or backward. I play mostly jazz and use traditional grip 90% of the time. For the last year or so I've trained myself to lead with my left hand, still using the trad. grip but like a lefty. Also playing open handed on the hi hat. It's really the only way I can play, though my right hand (in the comping role) is still very limited. The toughest thing is brushes. I was at one time very proud of my brushwork but aproaching the brushes lefty style is further complicated by the lateral/circular motion. I'm working on it but it's a serious. coordination challenge.Do your symptoms come up during activities other than drumming? I get similar, though less severe spasms when I eat, shave, write, etc. I do find I can control those if I concentrate ans move slowly.
I have not had any(useful) medical intervention yet, but I was only diagnosed a couple of weeks ago. I have an appointment with a neurologist coming up on the 4th. I'll let you know what she recommends.
