Since I had a stem cell transplant 2 yrs ago I seem to suffer with bouts of diarrhoea and can last for upto 3 weeks, I'm on Colesevelam for BAM, I've had lots of bloods test plus poo samples done nothing showed up, has anyone else suffered like this as both my nurse and consultant's are at a loss & it's causing me time off work due to my job I do, any advice or help would be appreciated