I've been "prepping" for a long time, probably 30 years or so. I started out my career as a population biologist and it didn't take long to look around and see what was coming down the road for industrial civilization. It's not an obsession, most of the time anyway

, but just my way of life. I like living in rural areas, I like farming and gardening, I've always preferred a low-stress slow paced lifestyle with no urge to live in the fast lane. My everyday way of life is what most people would call prepping.
I overcame despair before that. In order to have despair you have to have hope. Once you really realize deep in your gut that you're going to die, and that every day you get is a blessing of borrowed time, there's no room for despair. I had the good fortune of working in a hospital for years and dealt with death and dying every day, old people, newborn babies and everything in between. Some died from cancer, some we never knew what went wrong. I've held dead babies and washed the bodies of old people. Get familiar with death and lose your fear and despair.
I never had that much use for Carlos Castenada, but one of his ideas always struck me, the part about death being an ally, always just out of sight and urging you onwards.
I've also had enough personal experiences to know that the material world we occupy is just one small part of the cosmos and that some part of us, call it what you want, is outside of that reality and we're just here visiting. Make the most of the trip and enjoy the ride.
If you're having trouble with despair over the situation just try to keep your life in perspective. A poor person in a developed country today lives better than most of the kings throughout history. They live better than 99 percent of the people on earth today. I saw the other day that half of the world's population has never made a phone call. If you have a warm dry place to sleep and enough food to not be hungry, if no one is shooting at you, you're way ahead of the curve. Too often we buy into the media created reality where no one works and everyone is rich. Turn off the TV and unplug from media to look around the world and see how real people live, you'll realize how fortunate you really are.
None of us know what is really going to happen. The key to surviving whatever life throws at us is attitude and flexibility. In difficult situations more people die of giving up than malnutrition or freezing to death. Take up meditation. Just the act of sitting quietly and watching your breath for 20 minutes will calm the busy monkey mind and let you look at the world with fresh eyes. Read the Diamond Sutra, take a walk in the forest. learn to feel deep time, visualize the geologic changes that have created the place where you live. Any of these things will help change your perspective.