It sounds like you have symtoms of a head injury to me.
I would not doubt you for a second re: how you feel and what is going on with you, that you are concerned.
As well as the MRI, you may want to have an EEG done.
This may be able to see if you have a disorder, or if it is side affects from a head injury.
Everyone is different as far as head injuries go.
I do not know if I helped at all, but I hope that I did.