hello, post crown complaint is commonly due to wrong placement of crown, wrong impression and formation of crown , forcibly pressed crown into the gingival margins, or some periapical infections causing gums swelling and inflammations. there are few solutions for your issue , but the best is to visit the
dentist from where you have done this crown treatment and let them see the case in detail . tell the dentist your symptoms in details and i am sure he will remove this crown. will look into the tooth vitality and then will decide further treatment. wish you good health . regards