you have to train your brain and thought, else you will be hit with depression and anxiety.

1. Tell yourself those you cannot control like what will happen tomorrow, is not important, let it be, when it happens only try to fix it. Past had passed, tomorrow is uncertainty, enjoy now.

2. be grateful of what you have now.

3. Do meditation, it helps you focus on current moment.

if it is your job, change to other job with more support :X