I'm so glad to hear that the IVSM has taken some of your blurriness and ON pain away but so sorry to hear about the tremors that you are having

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I don't have MS but I do get a lot of spasms and tremors and my nanan had spasms also (she had progressive MS). My spasms are Myoclonic Spasms which I believe (but I could be wrong), you can also get with MS. I have tried so many medications to try and get the spasms to stop but nothing has helped me that much.
One of the meds that really helped my nanan with the spasms and jerks from her MS was Keppra and Baclofen. My Neurologist suggested Keppra to me but because of my age (13), he said that the side-effects could be too much and the med could interact with certain hormones.
I hope you get the tremors under control real soon and am keeping you in my thoughts.