Hey Joel,
It sux, but just because we stop drinking does not mean that life magically gets easier...life goes on with all its ups and downs. You're being tested and things like this will happen along the way on your journey. How you handle it is really up to you.
These are the tests of our strength, resolve and willingness to do whatever it takes to not "just" stay sober, but to learn how to live a full, contented life without alcohol as a coping mechanism.
Don't give that former supervisor your hard-earned sobriety - it's yours, rise above the mess and know that no situation will be made better by drinking.
Continue to reach out, call supportive friends/family, do something good for yourself.
Losing that job might be a blessing in disguise...stranger things have happened...recovery can be full of wonderful, awesome surprises - not always - but for me, things came my way that I didn't even know I wanted. It wouldn't have happened if I was still drinking. I'm sure of that.
Hang in there ~
Hb