I used Neurontin(Gabapentin) and stopped. I used it for nerve pain and decided I would rather deal with the pain since it did not really feel much different.
I use Baclofen but I am reducing it as well. Snoopy and I have the same thoughts when it comes to side effects. It is supposed to make you sleepy not create insomnia. Baclofen is good to reduce spasms (sort of) but a side effect is a weakening of muscles (I think).
re: your sleeping. That may be one of the sx's of MS and not due to any medication. I use Ambien and holistically, watch what I eat later in the day or evening. You would have to figure it out based on your work schedule.
I feel sick and tired all the time too. That is part of my MS.