Sore pain on gum and tooth. Normal?

I had root canal on tooth #46 lower first molar.  I had root canal as my dentist suspect a tooth root fracture and he suspect it might be the reason for my jaw and neck pain. I have lower jaw pain under ear and side of the neck since may. I had root canal 7 weeks back.same symptoms after rct too.I went back to dentist yesterday to get core build and temp crown.he told me to come back after 3 weeks to do permanent crown.  My gum and tooth are so sore and painful since yesterday.I took ibuprofen yesterday. Is it normal to have pain after this dental work?  It's sore and dull pain on that gum and tooth. I do have constant burning  lower jaw and neck pain still. So along with that,I have pain in this lower molar gum and tooth. Do I need to go back to dentist? Or this pain normal? I have sore pain on both side gums.When I run over my tongue at back of tooth, I feel some difference in the area between the gum and the white part of tooth. I feel some edges.is it because of crown?normal?