Thanks for a precise history.
With the history you have provided I would request you to undergo the investigations at the earliest as all the symptoms are interrelated and you know what I mean by.
Please consult a Surgeon, the first thing to do is get a Clinical/ Physical examination including the perrectal examination as this is the one which gives such an information no other investigations can do.
The blood, urine and stool work including an X-ray Chest, ECG and Physician's Check up.Colonoscopy
Contrast enhanced CT scan
of the whole abdomen ( not the lower one alone).
Treatment will depend upon the findings.