Your POINT of POWER is NOW. If your situation is happening NOW, then there IS a solution, whether you have found it or not. It will turn out, one way or another (just try to make it turn out POSITIVE) This is the importance of being proactive about solutions for things happening now.
But about those situations you never got closure from, your regrets, your mistakes, there is no way around those now, even though I know we wish terribly otherwise. Stop rehearsing them. That will do you no good. SOME situations have NO solution! Let's not torture ourselves. I am very guilty of doing this!
Instead, SINCE YOUR POINT OF POWER IS NOW, make plans and Backup Plans for your present and future. Be PROACTIVE about the present and FUTURE turning out Positive. If things do not pan out one way, have another way planned. In other words, THINK OVER PRESENT AND FUTURE SITUATIONS that DO have a SOLUTION. I have a Covid-19 Backup Plan. It involves this 9-person tent and a Portable AreoPress- Go Coffeemaker (since I cannot live without coffee) I have a plan. And a plan B. And down to Plans C and D, when I have no tent, is TO NEVER GIVE UP. THINK of SOLUTIONS for your life now, not your life then, that has already passed. You will get nowhere and will end up in the same place, every time. Do not be retro-active. Be pro-active. You got this!
Depression taking over
Working with depression AND an upsetting situation at the same time. WHEW! (Wish it were easier).
Anxiety and depression are taking over again. 
Going through a depressive phase.
Recurring depression/anxiety I think over work
