Hello! Good day! I read your concerns thoroughly and will break down all your problems systematically--
1.
tailbone pain --anatomically, the rectum (lower colon), is directly sitting on the tailbone. Any inflammation in that area can cause discomfort or pain in the lower back, especially the tailbone (sacrum). However, there is also a possibility that it is a separate problem, since previously you have had lower back pains. Lower back pains can be caused by several problems-- most common is musculo-skeletal strain, other causes are kidney stones,
urinary tract infection,
slipped disc, scoliosis, impinged nerve. The best diagnostic to rule out spinal bone problems in your lower back is a plain Xray of the Lumbo-sacral area (AP-Lateral views), an MRI might follow if with problem noted in the Xray.
2. For your rectal pain, since it was already documented on your CT scan that there is thickening in the area, a
sigmoidoscopy or a
colonoscopy will give us a direct visualization of the problem, a biopsy of the inflamed/thickened area might also be a good idea to know the cause-- whether infectious, inflammatory bowel, auto immune, or cancer.
3. Diarrhea/constipation/bloating -- this problem is probably caused by the thickening of your bowels. The main diagnostic that can give us an idea of what is the underlying cause will be the sigmoidoscopy/colonoscopy.
4. Sluggishness might be a symptom of
dehydration secondary to your diarrhea. I suggest you take in a lot of fluids, especially after an
loose stool episode, to replenish the losses.
I hope I was able to answer your concerns. Goodluck and may you get well soon!