I just have always found that I'm a couple of pounds up when I have my TOM. It's always been that way regardless of what I am doing in my life. It could be bloat, but I've never noticed any other signs of that. I really don't know how being bloated feels, so I'm no help there.
That said, I would totally weigh myself if I were in your position. Even with your TOM, I bet that you will be down!
As to the running to the bathroom, you'll get used to it and it will get easier.
Right now your body is probably finally releasing all the water it's been holding on to in fear of dehydration!
But I feel your pain...it's not great to keep dashing to the bathroom!