I'm a drinker and I have pain in my side when lying my ribs feel tender on left side when lying down like weight is pushing on them??

Stop drinking alcoho. I assume by your statement that you're drinking more than one standard alcoholic beverage each day (sorry for sexism but men are allowed two), in which best thing for your health is to quit, or at least drop down to just one each day (no averaging to make up for skipped days). Regarding pain on left side, too many causes to speculate. Go see your GP unless pain is so bad that you want to go to A&E.