Happy Birthday and Congrad's on 18 months, here are a few suggestions:
Have you made any new friends? I used Meet Up dot com and AA, met others through a neighbor in short I surround myself with support I may need and people/groups to do things with once in the while with or someone to call if I am down.
I am in no way suggesting you are a dry drunk however have a read of it as many go through or are going through many of the emotions you are experiencing, there many be something in there that clicks.
Have you spoken with your doctor? I know in my case the highs and lows ended up being due to Bi-Polar, wish I would have known this 25+++ years ago.
What are your interests and hobbies? Are you pursuing any of them.
Just a few things that helps me
Andrew