There are an increasing number of pediatric MS cases being diagnosed as the medical community increases its ability to diagnose MS. My earliest known MS signs were when I was 14, but there could be some earlier. I met a young lady who was diagnosed at 11.
Because so many symptoms can be found in a flow chart that includes MS, many people will think MS when it could actually be one of 400 other possibilities. There are other neurological possibilities or even vascular or even a blood borne cause. There are a number of mimicries which have to be eliminated.
As you are taking meds, a neuro would also have to factor the side effects of the meds as well as any symptoms which meds might be suppressing.
IF your idea is that MS may play a role or be a cause, I would encourage you to seek out an MS Specialist (a neurologist whose specialty is MS) and go through an evaluation. You might be pointed towards a different specialist altogether, but I think you will be better off for getting the testing. Please note that there is no specific test for MS. The MRI is but one tool as is the LP. I hope that you will find yourself always welcome here and I would encourage you to keep asking questions. Should you move towards a different diagnosis, there are many boards on this site which will be able to help.