Hi well come to HCM.
Since you are having chronic constipation
you might have strained a lot while doing
motion, and hard stool might have ruptured some small capillaris leading to bleeding.
At time there can be fissure formation due to chronic irritation,which might be giving
you pain.Use some stool softner like cremaffin
for few days continuoulsy might help
you to get rid of pain and bleeding. To correct chronic constipation regular exercise,
drinking plenty of water, taking fresh fruits and diet high i fibre like green leafy vegetables, salads etc can help you to overcome constipation.Your weakness may be
in relation to blood loss get done your haemoglobin
test as well and in need may consult your doctor. Thanks