Normally acidity or gas may not cause sudden back pains. Back pain of you may be due to sudden muscle catch or due to ligament sprain at spinal joint or due to disrupted disc or its content which may have causes like core muscle weakness so better consult a Physiotherapist to know the cause and treat it appropriately U may be treated with electrotherapy manual therapy and of course exercises and lifestyle modifications that can cure ur problems till that better take rest u can go for some hot water fermentation try to lie on flat surface and never try to lift weights on bending Thank u

Hello musculoskeletal causes Trauma Spondylitis Ligament injury should be ruled out consult orthopedician for further evaluation and treatment.