First of all this is extremely normal behavior, bulldogs are notoriously hard to potty train… my 7 mos old female has started peeing in the house AGAIN!!! I do not believe this is separation anxiety, this is something that he will control better as he gets a little older. My rule of thumb when they are that little is to take them out every couple of hours consistently (yes during the night) and praise him like CRAZY when he goes… he will eventually get it, and realize that he's supposed to go potty outside. I would give him space in his crate so he doesn't get a bath several times a day. I had a large crated area when my dogs were small so they had an area to sleep, drink water and go potty if I was going to be gone for more that a couple of hours.