Supernick, things WILL settle down in the fullness of time. Your innards are probably thinking 'Whoa! What's all this, then?', especially as you're normally a biscuit muncher. I'd suggest keeping on with the bananas (slightly 'binding'), then add in grated apples (very good South African remedy for the squits) for a few days. Leave off the mangoes etc until you've adjusted. You might also find really washing the fruit helps, and buying organic. Less chemicals and stuff to upset your delicate little balance!