Here's how to feel much less bad about the possibility of collapse.

The point of reading or watching information is to obtain it.

Once you know that situation X exists and has properties A, B, and C, it is not necessary to read again that situation X exists, and that it has properties A, B, and C. In doing so, you don't surface any new information. You just inject more cortisol into your bloodstream.

That cortisol would be useful if there was an immediate, external threat that merited activation of the sympathetic nervous system, but that is not the case. The only immediate threat is that you're stuck in a loop, inadvertently wrecking your mental state without getting anything in return.

The point of consciousness and attention is to model the world and its people as accurately as possible so that you can make the most useful predictions about what to do, and then act on them. This is why evolution gave you a brain. Paying attention to the same information over and over is not the proper use of these faculties. You are only doing so because no one ever bothered to teach you any better.

These behaviors are not a given. They are not hard-wired. They can be changed.

First: From time to time, if you're reading some article or thread or watching some video, ask yourself, "is there anything here I didn't already know, or that isn't similar to something I already know? How does any of this information change my behavior?" Too many people read the same negative shit over and over, and nothing they read changes their behavior. Even if there are superficial differences, what difference will it make tomorrow whether you read this barely-different variation on old information today?

Second: Recognize that if you keep getting yourself down in this way, you will have less wherewithal to do anything useful. If you know a food shortage is coming, can you buy 20lbs of beans and rice? Yes? Okay, so buy them and have done with it. You took the information and did something useful with it, and guess what? Once you've done everything you can with the information, you're supposed to stop attending to it. You're supposed to let your mind go on to something else!

Third: If you need more help with these ideas, there's an old saying: "Have nothing in your houses that you don't know to be useful, or believe to be beautiful." You would do well to apply this to your thoughts. You are not obliged to believe everything you think just because it happens to be in your head. You have a capability called assent. It has to be trained in order to have any strength at all, but once it does, it feels like having a superpower.

Ancient philosophies like Stoicism and Buddhism have taught about assent for thousands of years. The ancient philosopher Epictetus spoke often of this: the ability to make proper use of impressions, to use them rather than being chased around by them.

The person who anticipates a food shortage and buys dry goods and then forgets about it is making proper use of their impressions. The person who anticipates a food shortage, doesn't buy dry goods, and reads paraphrasings of the same information for five hours straight, is being misused by their impressions.

Fourth: Write down your thoughts about these things. Keep track of your efforts to recover from this dismal state of mind. See if you don't flip back through your notes one day and feel surprised that you've made progress that you didn't think was on the table.