I had a migraine yesterday, and i have felt off balance since. Also i keep getting deep sharp pains in various parts of my body. Can’t describe them really, don’t know if it’s nerve pain?? I also sweated all night. Keep worrying it’s a relapse and another lesion.
Migraines are a pain in the butt and can be very painful and the side effects can last for days even after it is gone 
I get migraines all the time but none of them has come before a relapse thankfully. Your brain in simple terms gets fried when you have a migraine, so that in itself can make your balance messed up. The sharp pains could be nerve pain, but for any pain it is best to go to your GP and not assume its always because of MS.