Heres something that might help you, since you seem to be suffering from the 'I'm getting worse not better syndrome'. Something I started doing when I went through the "man I sound crap" phase was to tape record what I was playing on a cheap recorder. When you play back what your playing it helps to get a feel how well you are playing and can also help highlight any areas that need improving (strings your catching/notes not playing clearly etc). Also theres nothing like the buzz when you hear yourself playing on tape and it sounds semi-decent :) Great boost for the ego!

Neal