Hey There , My Name Is Chris And Im A

hey there , my name is chris and im a ex-drug addict. i have been taking synthetic weed for almost 5 months and im having some weird withdrawal symptoms after stopping even after 14 days. at first it was only heavy sweating and no appetite. few days later, i start to feel numbness in my hands and legs then it spread throughout my whole body. i went to the hospital for a MRI scan but however it turns out to be nothing wrong with my brain. the last time that i've taken was on the 1st of January 2017 . can someone tell me whats wrong with me?