I have ms symptoms. Got MRI, it was clear. Could I have Primary Progressive? I'm 17 and scared. Twitching, tingling, tremors, Weakness, stiffness.

May not be MS. If those are your MS symptoms, you may be ok. At least, you may not have MS. Primary progressive MS may cause atrophy or weakness, but those other symptoms are not very common. Perhaps the cause lies elsewhere, such as with medical side effects, or a blood chemistry abnormality.