Hand shaky

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I have started drawing roughly a month ago, albeit mostly geometric shapes (fundies), and I would regularly draw for two hours a day without a problem.

I've been slowed down by my right hand hurting, which then I stopped giving my pen a death grip and taking breaks every half hour with hand stretches. It's gotten a lot better, but I'm dealing with my right hand feeling weaker, and a bit shaky. It's not too bad, but I recall being able to hold things, say, my phone, perfectly still. Now I notice it wiggles a bit.

It's odd, as I try to keep my wrist from moving while not straining it. The shakiness/weakness takes a slight toll on my drawings.

Is this normal? Am I simply over-exerting my hand? I just got a hand grip exerciser, hoping that it'll help. What else can I do about this?