Congrats Stu - It does get better. I agree that PAWS might be a factor to consider. After I read more about it I went "so that's why I'm feeling this way!"
There are a lot of chemical processes in your brain that are re-normalizing now and it can take some time.
My best solution, though, when I am feeling down is to try to go help another person. This can be as simple as posting on SR and helping a newcomer to being a sponsor. It is really hard for me to feel sad about myself when I am focused on someone else. I'll admit that I am "helping" somewhat selfishly to keep myself sober, but that is a lot better than the alternative.