It would help to know your age, whether or not neurological examination is normal. Was MRI of neck or head (or both)? The neurological examination is the key matter in giving a possible diagnosis. Occasionally MRI is normal in early multiple sclerosis (which normally begins age 20-40); conversely there are many people with symptoms like this who are normal to examine in whom no diagnosis is achieved and recovery occurs naturally in time. I think a consultation with an experienced neurologist might be helpful.