Welcome to the Forum Sugarplum!!
It could a whole range of things, there is a point when daily hangovers become daily withdrawals, and with that comes withdrawal symptoms.
But he really needs to see a Dr as it could be anything.
You'll find loads of support here on SR for you, which is important also as looking in from the outside at someone else's addiction can be a very frustrating and lonely place.
But you're not alone here!!
