There are a couple happening for me right now. One is having a conversation with my boss on Friday that has me worried I might be on the path to getting let go from my job. The other is I turn 43 tomorrow and like you, no family, gf, etc. Even though I haven't been sober I've been seeing a therapist for the last 8 months, and its been bringing up stuff which has also been making me feel really down and lonely lately.
Both of those are weighing pretty heavily on me at the moment, so I'm only on day 2 but I'm feeling quite motivated.