There is a form of migraine which causes paralysis and numbness and tingling, a hemipalegic migraine, it can also cause visual disturbances, and may or may not be accompianed by an actual headache or "migraine". I know this because I have been suffereing from migraine with prolonged aura for a year and a half and have researched this and my neurologist as well as my headache clinic have discussed that type of migraine among all others with me
Huh. I don't know anything about the pituatary gland thing... so it sounds like you're dealing with something other than just a complex migraine...
I have complex migraines sometimes too, with the weakness and numbness on one side of my body. I had to go to the ER for it once, I was really scared... sort of thought I was having a stroke too... but as soon as I got there they looked at my file (i've been to the ER lots for severe migraine pain before) and they were like "oh, yeah, that's a migraine symptom, no big deal" and they ran a few scans just in case, kept me there until morning to watch me and then sent me home, but everyone was really calm and all like "yeeaaaah i know it sounds extreme... but.... it's not... it's just a migraine...." even though my arm and hand were all blue and weak and numb.
but, yeah. if something showed up on your scans it sounds like it's more than "just a migraine" (although, i have to admit, i get some sort of twisted dark entertainment out of the phrase "just a migraine" that i think only migraineurs like us can laugh at when we're not having a migraine... and when we are having a migraine, we want to lash out at whoever is telling us we are "just" having a migraine....)
so... yeah, i dunno. maybe someone else here knows more about pituatary glands? i know there are a bunch of doctors that read these forums.. hopefully one of them will comment on your question.