Zofran is a drug that was invented for treating nausea in chemotherapy for cancer patients. It's use in MS is rare though it works better than anything else. The reason it is seldom used - it is more expensive than the ABCs when it is used appropriately. People who develop tremors should be put on one of the interferons to slow the progression of the disease. This should be done no matter the disease category of the patient.
Exercise is the first line of treatment.
Stretching, pool exercise, whatever you like. But it must be regular and at least 3 times a week. Stretching and range of motion for all joints should be done at least a couple of times daily. Usually in the am and not long before going to bed. This part of your exercise is done at that time because of the time you spend not moving.