From 3 years,I hav IBS -D.3 years back I done all tested are normal colonoscopy, endoscopy,usg abdomen, blood testes like cbc,crp,ana profile,prothidene blood test all r normal value.then doctor prescribed sarotena for 6months.my problem is solved. After 3 years now from 5 days I hav pain middle abdomen pass soft stool mucus along with little on drop blood.stool pass only 2 time in early morning. I consult mbbs  doctor  told it is IBS along with infection and prescribed refigut 400mg for 5 days.in medical shop I got rexigut 400 mg instead of rexigut 400mg.from yesterday I used rexigut tablet.after 2-3 hours swallowing rexigut tablet I hav mild pain centre of stomach region slightly for 1 hour after it stops.can I do repeated testes like colonoscopy and endoscopy and other blood testes.please reply.can for 3 years can colon becomes IBD  colites.