You have a serious problem . Many people don't even drink the amount of 3 liters of any liquid a day. I am surprised you haven't developed anything serious until now you are so lucky! Cider sure makes you fat. You must cut down the amounts immediately and work out as well. You need to find  the time of the day when you drink most, Is it in a certain situation, is it  whenever you feel something, you have to figure out what are the symptoms that lead you to it.  You have to try and find a substitute for the cider. You might want to start drinking small amounts but spread it over the whole day. Gradually reduce the amount. Start exercising after exercising never drink the cider try water if you can't stand it maybe try a juice Apple juice would be better.