This can be ruled out by a CT
scan or
MRI. To diagnose a TIA or mini stroke you need to have a
MRI close to the episode. If TIA is suspected then all predisposing factors to TIA should be ruled out like polycythemia vera, sickle cell disease, diabetes, hyperviscosity syndromes, hypertension etc.
Yes, MS too is a possibility but one cannot say for sure unless tests are done. Please consult a neurologist. Take care!