There are a lot of things that we worry about in life. Dare I say, the worry is valid. But for every worry that is weighing you, challenging your hope, causing anxiety, write down a positive outcome contrary to it. Stand on that.
There are environments that are detrimental to your productivity. So, you must mentally build resistance to the environment, while persevering through it.
Build up your faith. Faith helps overcome the hard situations of life. Build it up so it's strong and steady; that when it looks like everything is descending into an abyss, you can still stand, still push through, still hope, still persevere.
As long as you're breathing, there's hope. There is hope for right now. There is hope for tomorrow. Hard times do not last forever.
Keep going.
