Anxiety and sobriety

I am 28 days sober today after over a decade of excessive drinking/alcoholism. While I feel great physically, I am also experiencing absolutely debilitating anxiety, guilt and obsessive thoughts about all of the mistake I made while I was drinking and in my life in general. I don't know how to handle this. I went so long numbing my feelings and not caring about anything that all of these raw feelings are consuming me. These mistakes are big mistakes too that if I wasn't drinking I would have been more mindful of. I am fearful and in constant panic.