I used to be in this pit too (and still dip back in every once in a while)
What helped me was recognizing what “negative Nancy’s” sounded like
What I sounded like. I recorded myself once and just kept tally of all the times I disagreed, argued, or tried to push on something that wasn’t worth pushing about.
Are you feeling depressed? Have you tried talking with professionals or maybe even just your family about it? They likely know you best and will be able to help you out.
Sometimes talkin with a good therapist you can vibe with a bit just helps to see these alternate viewpoints that your cognitive bias won’t/can’t see
Might be worth it. For me, and it seems like maybe you too, getting fed up with myself was the first step to being critical and objective about my choices in behavior. Sometimes being a bit “lighter” about stuff is what you need to help reset. But that can be hard if you’re struggling physically to produce enough serotonin or whatever the ailment might be. Other times it’s just habits you need to change.
Life is too short to be miserable. You will die the same way unless you take action to course correct and start living more brightly.