Here's what happened: Percocet.
Percocet absolutely nullifies spasticity, in addition to nullifying a significant percentage of pain from MS. I was on 10 or 12 Percocets a day while I was in the hospital for two weeks. When I got out of the hospital, I quickly made an effort to decrease my Percocet dosage as much as possible. Within a week or two of getting out of the hospital, my daily dosage was down to about 20% of what I had taken every day for two weeks in the hospital. Surprisingly, I had no withdrawal symptoms.
What I now know is that with 2-4 Percocets a day, I no longer have to deal with spasticity, or the extreme pain that's a byproduct of spasticity. I will run out of Percocet within a couple weeks. Hopefully I can find a doctor who is not a fucking idiot to prescribe me more of it. I have no interest in abusing Percocet. My only interest is in decreasing my pain and spasticity, which has made my life miserable.