How do you keep going when you've had to start your life over?

31M buzzing in here, and my life totally fell apart in only a few months. I totaled my rig which raised my vehicle and insurance costs beyond what I could afford so I had to get rid of the car, and this meant I also had to give up my career in construction because I could no longer travel to all the job sites around the state. I moved back in with my folks in another state, and my girlfriend and I had to split because it ain't right for her to be waiting on me while all this gets sorted. I was ready to propose to this woman and all those plans went up in smoke. She still calls/texts me but I don't really talk to her.

I'm taking steps to get outta this situation. Found a min wage job within walking distance that can generate some income so I can buy some old junker and find a new job, but going back to construction ain't an option so I'm starting my career back at square one. Any extra cash is going to pay off debt. No eating out, nothing with friends, no subscriptions, nothing extra. But even though I'm making progress it feels so crushing at times. I can't stop thinking about the life I had only half a year ago and how it's all gone, and now I have to start over and find a new career, place to live, etc. I also ain't sure I'll ever date again because she really felt like The One, and it'll take a long time to get over her.

For those that have also had to hit the reset button, how do you get through it? How do you not fall into despair even when you're on the right track? You might say I still got decades in front of me but it sure don't feel that way when everyone I knew from my now former life is miles ahead.

Thanks