female blood in stool

for almost 2 years i have blood stool. sometimes it is a hard other it is soft. I have had a lot of test done, They couldn't find any think. Was told bt one doctor that I push to hard. At time the bowel movement fells like child birth. Before this I had a bowel movement every other day, now i have severawl a day. It is little easier it i prop up my feet. Some time There is also pain in my virgnia. I take an aspinin a day and other pain pills for my arthist. i friend said that may be the cause help i no longer have periods, but this blood is daily anyway