I know it sounds bizarre but I just wondered if it is possible to be "bunged up", but still have normal(ish) bowel movements?
I've been to GP due to loose stools and feeling like I wasn't fully getting rid of everything - she did loads of blood tests including coeliac and they all came back negative. She gave me a diagnosis of IBS.
At the same time, I took it upon myself to do one of those York Tests, and it came back that I was sensitive to gluten and wheat. I told GP and she dismissed it as being not very reliable, but I stopped eating gluten and things started to "firm up" a bit! 
I don't eat bread or pasta but I am not super strict with no gluten, and my bowel habits tend to range from loose to solid and everything inbetween.
Anyway, I am just wondering if there is a possibility that you can have a build up of faeces on your insides, because I often feel a bit full, even after going to the toilet?
If so, has anyone ever had this and what can I do to help?
I eat quite a varied and healthy diet, but I do have a penchant for chocolate/crisps/bad stuff...