I had my worst relapse a number of years ago causing me various problems one of which was Dystonic Spasms. This caused my legs, feet, arms, hands and head to contract and contort in painful positions, these only lasted about a minute but I found them very distressing as it was difficult to breathe while they lasted. They were happening every couple of hours at first then every time I moved, my whole body was becoming stiff between times but I found I could move freely just after they occurred. At first I was given Baclofen to try to control them when this didn’t work after a couple of days I was given Diazipam which brought them under control. I still take Baclofen but came off Diazipam after a few months. I haven’t had this happen since but I live in dread of them starting again, for this reason I will take Baclofen for as long as my GP will prescribe it.
Give Baclofen a try if you don’t like it you can come off it we all react differently to medication. Of course if your Dystonia is caused be a neck problem not your MS then Botox to release the muscle spasm may well work instead of resorting to medication. I just don’t like the sound of injecting Botox but I do know lots of people use it to help with bladder problems caused by MS so why not your neck.