As per your query,you are passing blood in stools.It is bright red in colour without pain .It could be Internal haemorrhoids which are not seen externally.
To confirm the diagnosis,you should be examined with Proctoscope by your surgeon or else you can go for Colonoscopy
for complete visualisation of large intestine,Rectum and anal canal
If you come back with above reports,i will clarify further.
Till then take high fiber diet,drink plenty of liquids.
For abdominal pain
,please take antispasmodic like Dicyclomine
Wish you good health