Even 5 beers a day is not drinking sensibly, I'm afraid. And 16 a day, sheez. Good thing you got sober.
You said 3 years ago you "stopped to look after you mum", does that mean stopped entirely? Good for you. For an alcoholic (and sorry, at 16 beers a day that is what a person is) there is no such thing as "drinking sensibly," stopping all the way is the only solution. (Not 5 beers a day, that is still being an alcoholic.)
If you are now an alcoholic who has stopped drinking entirely, your next step is to see a doctor and get a complete work-up, discuss all your concerns, and get on a healthy track diet-wise. If you've stopped, you have already done the hardest part of this, keep the momentum up and see your doc.