Thsnks for your query . The pain that you are experiencing near your waist is probably suggestive of renal stones
. I would suggest you to get a ultrasound
abdomen done and depending on the size of the stone it can be treated conservatively or may require surgery .
The blood in stools is probably suggestive of acute / chronic anal fissure
or Hemorrhoids . This can be evaluated by a proctoscope . I would suggest you to consult a surgeon and consume plenty of fluids , fibers in the diet and use xylocaine
ointment along with sitz bath thrice a week after every motions for a week .
The pain below your arm could indicate a sprain
. I would suggest you to get an X ray of the forearm involved and consult an orthopedician and use painkillers to relieve the pain .