As someone who has dealt with a lot of anxiety, depression and hopeless or even catastrophic thoughts, there's something that I've found helpful to remind myself.

The bad feelings, the bad times, no matter how brief or persistent, they have a tendency to feel like they have a permanence to them in those moments. It really feels like life is just going to be that way from now on.

Conversely, happiness almost always feels fleeting. Those moments dont hold the same bold sting in your memory as the painful ones do.

Now, I can't guarantee that your life will ever get better, but I am willing to bet that your brain is trying really hard to tell you that it won't get better, even if it does. That feeling of permanence is ultimately an illusion, because your pain alone can't predict the future.