welcome and i hope you find the answers and the strength you need to get yourself through this.
i met and fell for a guy who was a drug and alcoholic (even though he would never admit that he was either of those things...he just occasionally did acid and drank A LOT). after finding SR i realised that this was not the life i wanted for myself or my children, so the people on this site gave me the strength and the knowledge i needed to walk out of the train wreck that i was heading for. this man too was successful in his profession, and seemed to have his life together. dont ever give up your friends for someone, unless that friend is a negative influence. and please dont shut your family out. you may find that at least one of them will be more supportive than you are giving them credit for.
good luck.