Hi Dear !! Thanks for your query to HCM .
Read and reviewed your query and health concerns.
IN the given situation, You seems to suffer from-
Anal Fissure / or
proctitis /with infected piles.
The chain of partying on back to back weekends has lead to black stools,has precipitated any of the conditions as noted above.
Other causes need to be investigated,before planning treatment for thin,narrow stools in your case.
Consults with Surgeon/ and stool-ova/
cyst would fix the cause.
Hope this would help you to plan further of this complex illness of yours.
If need be, update any health issue 24 x 7 by a direct question to ME, at following HCM link-http://doctor.healthcaremagic.com/Funnel?page=askDoctorDirectly&docId=70229
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You are most Welcome herewith !!
Good Day!!
Wishing Good Healthy Life in time to come!!
Dr.Savaskar M.N.
Senior Surgical Specialist
M.S.Genl-CVTS