You not going for speech therapy ? That usually helps a lot , provided you work hard with the techniques. It can really make life smother for you. I'm also very severe and I'm planning on it from January February month.  Also , why don't you speak to a neurologist. Maybe there's certain meds that can help you get your fluency back. I only came to know about dopamine and other Neuro issues few months ago. So this new year coming, I'm going to push towards getting rid of this stuttering. Same like you bro , it's made my life hell socially when it comes to girls and stuff.