Re: Blood in stool. Hypochondria.
Blood in stool is something that warrants investigation. It could be hemorrhoids or some injury to the rectum, but it could be something else. Since it's been happening infrequently for a while, it's not likely to be too urgent, but do look into it. I would go back to the dr who told you to come back if it didn't improve.
Blood tests that are looking for something else would not necessarily find the cause.
Have you tried any hemorrhoid treatments?