Watch your brain doesn't run away with you. Once you start feeling "broken" you become hypersensitive to discomfort. Twinges that may have been around on and off for years suddenly get singled out as problems, when in fact, we all have occasional pain in many places that is medically insignificant.
Especially as we get older, since by the late 30s and early 40s we start to acquire a brittleness, tell tale arthritic discomforts, and gastrointestinal jabs that signal the end of the free ride of youth, but aren't necessarily evidence of any relevent medical issues.
Your issues seem largely unrelated, and don't seem to link to any severe medical issues.
GI problems will cause radiant pain right into your back if you keep eating the wrong things, even on meds. Postural problems due to a loss of physical fitness will result in radiating back pain, and still other back problems can be treated with a couple of visits to a Chiropractor.
Eat better, get more actiive, and quit obsessing over your health so much.