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It sounds more probable that the sharp anal pain may be another fissure as a possible cause.... A hemorrhoid may be behind the new pain... No blood in stool on sight is good but testing for occult blood that you don't see should be done too..
I think the problem deserves to be checked ...
I do not think that it is likely at all that it is a presentation of any cancer -- no to that ... Colonoscopy 15 years ago is not too relevant this far in time though ...
So I would recommend that you consult your doctor or gastroenterologist or general surgeon to help evaluate the reason for current symptoms...
Try not to be in fear of cancer as that is not likely culprit ( base would be covered in your probable testing going forward from here too however )
I hope that this information is helpful for you
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Thank you and Best Regards
Anthony Bray MD