Look into the diagnosis of RSD reflex sympathetic dystrophy, its a very painful neurological condition which is usually caused by a nerve injury but sometimes the person has no idea how it was caused. try seeing a pain management or an anesthesiologist they are who helped me I saw 56 doctors befoe I was diagnosed if you want to look RSD up try RSDSA.com and it has all the symptoms. There really isnt a good way to diagnose usually its just by symptoms