Most people with MS live a normal life span.

A long, long time ago in lands far away this was said. NO, it is not fatal now! Please learn about MS from trusted sources and try to ignore most of what "people say". It's usually wrong.

yes i have read that to because your body starts to break down over time which leads to another phase of the ms.

It’s not fatal. There is plenty of medicine options to help with the symptoms of MS. I have had it for 11 years while being pregnant with 2 children.