I think the stress of a newborn (and presumably the exhaustion that comes with having a baby) has added to your existing anxiety and has, understandably, led you to get things out of proportion.
I'm on the app on my phone so can't see your post while I'm typing so will just reply to what I can remember.
Climate change - that's the serious one. As individuals we just need to do our bit by reducing our direct and indirect use of fossil fuels. Governments need to step up. As a new mum, you don't have the time or energy to campaign so let that one go.
War: the situation in Ukraine is terrible for Ukrainians. Donate if you can afford to. It won't lead to a 3rd World War.
I lived through the Cold War in the 80s. My Mum lived through the Cuban Missile Crisis in the 60s. There we were times of tension when it felt as though the world was going to end. It didn't. It won't.
Food shortages: Brexit, supply chain issues, Ukrainian war, poor harvests etc have all caused problems. Lots of gaps on the shelves.
BUT there is still still a lot of food in the supermarkets. We don't have a lack of food; we have a lack of choice. Over the last few decades, we've got used to the idea of being able to buy whatever food we want whenever we want to. We have become divorced from the idea of seasonalality. We just need to adjust our shopping and cooking habits.
Refugees: people who endure long, dangerous journeys to come to the UK do so out of desperation and a desire for a better, safer life. They don't come across specifically to attack British women and girls.
Most are decent. Some are nasty, violent, mysogynistic shits - just as is true of men who are born in the UK.
If you worry that male refugees pose a major risk , it's probably down to a mental shortcut called the availability heuristic.
If you see a newspaper or tv report about a male refugee or asylum seeker who has committed a rape or sexual assault, the report will mention his background. If there is another case, the background will be mentioned and you'll notice that there's been another case.
But if a rapist is born in the UK, that won't be newsworthy, won't be mentioned and your subconscious won't be noting how many men there are who are born in the UK and have attacked women.
Similarly, there won't be many newspaper or tv reports about the majority if male refugees and asylum seekers who are quietly getting on with their lives, studying or working, bringing up families etc so you won't have a stock of those mental images to counter balance the other ones.
Try to find someone to talk to in real life about how difficult you are finding things so that you can manage your worries and start enjoying your time with your baby.
Sending a virtual hug!