First, it is possible but you have to be all in. This is something that I have learned recently that has made a difference. You should quit for good because once you are down this path there is no going back. If forever is a scary thought then say until you are 90 or some people like to say a date when they will be dead like your birthday in 2100. It sounds like your health is being affected so latch on to that for motivation. Also, you must know that basically ALL of us have been where you are and many still are. Start making a plan and get a quit ready. Keep posting here. We are all rooting for you!