It is a rare person who gets back to normal after a relapse. Most MSers get to a new baseline after a relapse. They have residual symptoms that are the result of brain or spinal damage. These residual symptoms may fluctuate a bit but they become the new normal for the MSer.
MS is considered progressive. It will get worse over time with the patient adding more and more symptoms to manage. I am sorry to hear of your diagnosis.
Cognitive issues are a problem with people who have MS. It is one of the main reasons MSers often don't work.
If you are not seeing an MS specialist, you may want to consider it.