1) at your age with a normal angiogram and MRI, and no other risk factors for stroke, and given the clinical presentation, a vascular cause is very unlikely. I presume you are not using drugs like cocaine etc which can cause spasm of the cerebral arteries.
2) an EEG might be useful to ruleout a partial seizure as a cause. Also, migraine is another possibility, whether or not it is assocaited with headache or not.
No but I can relate on the basis that I am a 29 year old female and have for the last two years have experienced some form of fascicultation and numbness in both upper and lower extremeties starting the year of 2003. After the delivery of my son. I have experienced nubness stiffness and tingling burning sensations in my hands feet fingers and toes even partial numbness on the left side of my arm and on the side of my face. I even awaken to loss of feeling in my arms and hand which may take up to five minutes to return, which can be very nerve wrecking . I also experienced loss of feeling in two of my fingers for over a week didn't quite understand what that was about have been tested for all types of diseases still no answer on what could be wrong I've had everywhere from an EMG to MRI'S to Xrays performed to bloodwork and still don't know what this is I have been told that it could be Ms. Still hanging in limbo I think I need to consult a second opinion hopefully I'll get some answers soon maybe we both will Best Wishes.
It could, potentially, still be a TIA however it does sound a bit unusual for it to go on for such prolonged periods of time. The fact that it is so stereotypic makes me think of possible focal seizures (which also don't go on for a long time but may leave you with a funny sensation afterwards). Have you been tested for them? A doctor usually performs an EEG test looking for local abnormalities in the brain.
In terms of the TIA, have you had a brain MRA done?