Is there anyone out there who has Multiple Sclerosis and is in their 20′s?

My boyfriend has been really sick lately. The doctor says it’s either advanced lymes disease, He’s really run down, or in a worse case scenario, MS. He is only 21. My mom has this disease and was diagnosed at the age of 44. I’m extremely worried, after seeing what my mom has to go through, and i don’t want to see him have to too. If you Have Ms, please tell me your symptoms and when you were diagnosed, so i can figure out if he’s too young and can rule this out as a possibility.
Thanks and God bless