I cannot give you a formal clinical opinion as this forum is purely educational, so my advice may be limited.
By periodic cycles, do you mean with your menstruation - some forms of migraine cluster around menstraution (called catamenial migraine)
Migraine can cause focal symptoms such as weakness in the arm or leg that can last beyond the headache for a few days (andin rare cases longer). Other causes of focal neurological symptoms need to be excluded before this diagnosis can be made such as with an MRI to rulout a mass, MR angiogram to ruleout blood vessel blockages and an EEG to rule out a seizure. Migraine does not cause optic neuritis so this diagnosis should be clarified as after isloated optic neuritis, about 15% of people go on to develop MS, although your negative MRI does not suggest that this will occur.
There are a variety of migraine medications that can be used for 'complex' migraine such as calcium channel blockers. In general the triptan medication are to be avoided as they can casue spasm of blood vessels which may be dangerous in patients with focal neurological symptoms.
Good luck
9-04. Some of the same symptoms you described are what I have experienced. You may want to consider a EEG or a video EEG. That is how they found my condition. The MRA and MRI showed nothing. Something to think about anyway. Good luck.