Sometimes your body can go from one symptoms to another in a heartbeat. I went from C to D a few months ago too and it was very quick. Have you had any tests done? The thin stool could be just hemmhroids however you may want to get it checked out. Narrowing of the intestines due to inflammation can cause thin stools as well and its best to rule that out. Are you taking any antispasmodics for the cramping? It might be worth mentioning to your doctor so you can at least get some temporary relief while you wait for answers.
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