I read your problem.You have pain at lower back with Swelling on both side. Is that pain is throbbing type ? If Yes, Then It could be Infection.This can be treated with Antibiotics like cap. Ampicillin
& Pain reliever - Aceclofenac
. If Pain is Dull aching & deep,it may be of Spondilitis or any unknown injury
on lower back. this can be treated with Pain Killer - Aceclofenac + paracetamol
drugs. You need Some Hot bag fomentation at Back too.
Thanks. warm regards.