1. Your thinking is important
Make sure your thinking doesn't get or remain negative. You may be unable to change your circumstances in the present but you can think about better things for the future. Be sure not to set your mind to a negative default. The situation notwithstanding find things to focus on that are positive. If you are out of a job, think about your perfect job and how great it is that you get to look for it now. Your thinking is critical when the chips are down and it is within your control.
2. Be the boss of your emotions
Don't be on an emotional roller coaster. Yoga can be helpful as can meditation. Some people find that adjusting their diet can be critical to managing their emotions. Spent time in nature. Find what works for you and do it. Keep the good feelings flowing.
3. Know that nothing lasts forever.
Your situation is temporary. It will change. When things are not going well it is key to remember this. I like to think of life as a sine wave. Sometimes things are rising, sometimes they are falling - there are crests and there are troughs. If you are in the trough, know that it won't last forever and your positive thinking and emotions can hasten your exit from the trough.
Most of all know that you are not alone. Reach out to those positive people in your life who can offer support and good advice. Search out uplifting videos. Listen to good messages and relax.