Do you pass blood in stool
Any rash on your body when you get a fever ?
Since you have sacroilitis, there is chance you may be having Ankylosing spondylitis
. This disease affects many parts of the body including the spinal bones and make them stiff like a bamboo stick causing back pain. Patients also have Inflammatory bowel disease
which causes abdominal pain
, diarrhea, fever, fatigue, dry eyes. The dry eyes could be due to less production of tear fluid. You need to get a Paper test done to find out. This can be done by the Ophthalmologist.
Regarding the pain above the anus, you probably have coccalgia or pain over the small spinal bone called the coccyx. This pain can be relieved by consuming Diclofenac tablets under medical supervision and avoiding bad posture while sitting, continuous sitting and constipation. Eat a diet with plenty of fresh fruits and green leafy vegetables. Avoid spicy, oily and milk containing food. Drink 1-2 litres of water daily.
You may need t consult a Rheumatologist
for proper diagnosis and management. You may need immunosuppressants if you have Inflammatory bowel disease.
Wishing good health.