I try and think big picture. I look at things historically and globally. If life is getting you down now you should read history. It's less that 100 years since every household in the developed world had indoor plumbing installed. Clean water to drink. A whole tub of hot water to soak in every day! Flush toilets! Look around the world, millions don't have these thing now!
Smallpox eradicated. Peope used to say if you got soaked in the rain a hundred years ago, 'you'll catch your death'. Why, because without anti-biotics which became widely available in the 1940s a cold often killed people. The side-effect of a cold - a chest infection, bronchitis, often saw people off. Do we expect to die from a cold now? Of course not. Children are now innoculated against Rubella which used to cause many babies to be born deaf and blind.
All the lovely food in our refridgerator and cupboard from all over the world. Olives, oranges, pineapples, spices, potatoes, mangoes, avocados, strawberries, blueberries etc etc. I read a novel once about medieval Britain and all they seemed to eat was mutton and onions and more onions, every day.