I can understand your concern and will answer your queries the best possible. Your symptoms are probably due to a chronic anal fissure or hemorrhoids. It usually presents with blood in the rectum and pain during defecation. The chronic fissure is a linear tear in the lower anal canal while hemorrhoids is a condition where there is dilatation of blood vessel. There are 4 types of hemorrhoids:

a)First-degree hemorrhoids: piles within that may bleed but does not come out.

b)Second degree hemorrhoids: piles that prolapse during defecation, but returns back spontaneously.

c)Third degree hemorrhoids: Piles prolapsed during defecation, can be replaced back only by manual help.

d)Four-degree hemorrhoids: Piles that are permanently prolapsed.

I would suggest you to get a complete blood test and stool routine and get an endoscopy done. You can use painkiller like ibuprofen twice a day after food for a week and consume a high fiber diet, use a local anesthetic cream like lignocaine 2% foe application after passing stools. Try this for 3-4 days, and then consult your surgeon.