I was constipated for a couple of days and after...

What is the appropriate treatment for your condition?
Treatment mainly depends on the cause, so it's recommended to see a specialist doctor for evaluation of your condition. Regarding the bloody stool, one of the commenest causes for bleeding from the rectum is hemorrhoids which can be treated accoring to their grade. In early grades, warm water bath for 15 minutes twice daily, treat constipation by increasing the intake of fiber intake, drink plenty of water and taking some laxatives such as lactulose. In advanced stages they will be treated surgically. Also in anal fissures, treatments will be nitroglycerin topical ointment, a pain reliever such as lidocaine ointment as well as following the previous advice. Furthermore, Daflor 500mg can be used in hemorrhoids for bleeding. 

Diagnosis:
Clinical medical examination by a general surgeon, which includes a rectal examination with knowledge of your medical history, a complete blood test to detect the presence of anemia, anal examination with the possibility of making an endoscope for the rectum and colon, an x-ray of the abdomen, a gastroscopy to detect a stomach ulcer, as well as PT, PTT can be done

What causes anal bleeding?
1. Gastric and duodenal ulcers
2. Hemorrhoids
3. Anal fissure
4. Crohn's disease
5. Ulcerative colitis
6. Diverticular Disease
7. Benign or cancerous tumors
8. Blood diseases
9. Other reasons

Recommendation:
It's recommended to see an internist as well as general surgeon