Hello, how long have you been diagnosed with MS?
Do you have the report of the MRI?
What medication are you taking?
What MS symptoms do you have at the moment?
MS is a lot to cope with, so if you have other stresses in your life on top then I would suggest that you see a counselor so that you can learn how to deal with the emotional impact.
The sweating symptoms may very likely be caused by the Copoxane. This may improve with time as your body gets used to the medication. There are some simple things you can do to help.
Wear loose cotton clothing that lets the moisture evaporate easily. Drink extra water to make up for the losses. Use a luke-warm sponge down when you feel particularly hot.
Specific sites can be injected with Botox to reduce the sweating for a period of time. This may work well for under the arms but less so for other areas.
It is also causing you to have increased appetite which is where the recent weight gain is coming from. You will need to be able to use low calorie snacks (fruit etc) for when you really cannot ignore the hunger pangs. If you feel up to it, then moderate exercise will help burn the extra calories but do not overdo the exercise. Aim for 30 minutes a day.