hi i had gone through your query and understand your concerns. i would come up with two possibilities
1.the first one include;ACID PEPTIC DISEASE;
-too much worry,anger esp if they are suppressed
-taking pain killers frequently are some possible causes
2.second possibility is,CERVICAL and LUMBAR SPONDTLOSIS;due to degenerative changes in the cervical and lumbar spine
scanning for cervical and lumbar region may confirm the diagnosis.
I hope this is helpful for you, thank you