i have been having bad headaches for a while now. i went to the hospital in august and the doctors told me i had a cluster headache. They gave me medicine that worked for a little bit. but now no medicine works at all, my headaches are unbearable at times where i cant stand up without blacking out or getting sick. The pain is only in my left side and there is a sharp pain that goes behind my left eye and my eye gets blurry. my left eye waters, my left nostril gets stuffy, i get tooth aches on my left side only, and my left ear clogs up. now just recently my left arms get like an arthritis pain all the way to my finger tips, and my neck gets stiff on my left side only. i dont know what it could be but it seems to be getting worse.