If people are diagnosed earlier with ms, does this increase their chances of ms getting worse because u have longer to fight the illness?

Perhaps reverse: Earlier diagnosis is made, the earlier treatment can start. Better outcomes are achieved. Note you are young and on tysabri (natalizumab). Kudos to your neurologist, as the evidence is very strong to support the most potent medications early. The interferons are no longer the direction to start, and those who take potent meds early, supplement vitamin d-3, follow low fat, low salt diets do well.