So yesterday during w5r1 I got an unbelievable pain above my stomach area. Kind of between belly button and rib cage. I carried on going but during my 5 min warm down I was in agony. Got home and collapsed on sofa and realised I was very swollen/bloated as well (could see it and feel it).
The pain went after about 2 hours but it was just bizarre. It felt like I was pulling my tummy in the whole time. Wasn't like a stitch (or no stitch I've ever had).