Poor you, you sound as if you are at your wits end
Take a deep breath and try to take things in small chunks rather than as one big problem
1) Has he always soiled in the house, or has he (at some point) been toilet trained? If he is house-trained, but is no longer able to hold it, then I would recommend a visit to the vets to rule out any medical reasons. If he gets the all clear, then you can begin to go back to basics and take him outside every half hour or so, as well as after every meal, and give him loads of praise/reward when he toilets outside. If he does have an accident indoors, ignore it and clean it up with biological washing powder so that the smell is removed.
2) Chewing/destructive behaviour can be a sign of stress, or boredom - how long is Bob left for? A crate will keep him safe while he is left alone, but shouldn't be used for more than a couple of hours at a time, really.
3) Turfing the contents of the bin out sounds pretty typical cocker behaviour - living with a dog sometimes means making compromises - a lidded bin, or raised on a shelf is the most stress-free solution
