Really sorry to post this. Bit of background....i have never been all that regular but can normally go when i need to. Sometimes every 2 - 3 days. A few years ago i suspected ibs as i wouldn't go for days but then would need to go NOW!! And it wasn't pleasant. I actually took to seeking out quiet public loos that i could get to easily from work. 
Then i worked out - too much crap was the trigger. Too many cakes at a work birthday, mcdonalds breakfast, fish and chips, chinese, DH mums homemade lasagne. So, fat/grease then. Normally if i eat healthily i don't have the sudden onset gross 'toileting'
However i have felt a bit bunged up the last few weeks, and haven't been on any sort of health kick. So thats unusual. Eating ok but with some cake/choc/desserts thrown in. Started a bit of a detox monday and no change. Have been twice in 5 days which would not be THAT out of the ordinary but am feeling the need to go, but not able yo. This has never been a problem for me!!! Please help/recommend something to get things moving. Feeling sore in the lower tummy area.
(diet atm consists of two yogurts, two portions of fruit, lots of veg/salad, chicken, tuna, eggs, and LOADS of water)