Hi , I've Been Going To Doctors Since 1987 When

Hi , I've been going to doctors since 1987 when I had a mass in my brain that cause my left arm to have weakness in it. now the specialist I'm seeing now does not think I have MS. Because where it should be located in the brain it is not there. But I have 3 small tumors and a big tumor in the back of my left ear sitting on the brain stem. But over the course of years I have out breaks with balance and numbness in my legs and foot, arm. why can it be if it's not MS?