Bump on gums.

[ari19]

December 2020 I got a root canal, the tooth was pretty infected when it was preformed. After the root canal I noticed a hard bump on my gums above the tooth, both my dentist and the endodontist who preformed it told me not to worry and it’ll go away. Since then i’ve gotten a crown put on the tooth. I’ve spoken to them both multiple times about the bump and neither of them can help me, it is painful it gives me horrible headaches often, the endodontist did go back into the tooth and did another treatment on it but the bump remains. This cannot be normal, i feel like neither of them are understanding just how much pain this causes me. Please does anyone have any idea what this could be? The bump is hard, hurts to the touch, and sometimes causes headaches and pain.