I also have upper motor dysfunction and spasticity from a neck spinal cord injury (motor vehicle injury, broken neck). Valium helps the most with the spasticity though I more often use baclofen. I have a neurologist that prescribes these meds.

When I get what you are describing- for me when I raise my arm up I get mid back spasms and cramps- I up my baclofen dose to the max dose and add Valium 2x day. It takes usually 2 weeks for the spasms to stop. For me, luckily , since I’ve been on appropriate meds, I only get these attacks a few times a year. I have yet to determine a trigger.

My spasticity also seems to worsen when I get into bed with jerking movements in my right leg. Baclofen an hour before bedtime helps a lot

My lower extremity spasticity causes an abnormal gait which increases my risk for falling. I cannot tandem walk. In a recent PT session, a vibration plate was tried. It helped tremendously! I am in the process of getting one for my home. The specific frequency and duration of use ( I use mine 9 minutes a day) have to be worked out in PT so I wouldn’t advise getting one until this is done.

It is important to go to a Neuro only PT for a course of therapy 1 or 2 times a year to be sure that the specific therapies are still appropriate.

This is just a jumping off point. I’ve lived with upper motor disease for 37 years. Only in the last 5-7 years has it been so life consuming. Any other questions I can answer, just ask.