Get out of the habit of worrying. Take some time to meditate early every morning before anyone gets up. 20 minutes in the morning and then again in the evening or mid-afternoon. This practice will condition you to see the fears that you have are without substance and you will develop inner confidence from a growing inner stillness. You will be more present and can deal with each life situation with calmness and clarity. My HubPage https://hubpages.com/health/Breathing-Stress-Relie... deals with this and I also discuss meditation in another Hub on the purpose of meditation.
Practice regularly to condition yourself out of the habit of stress.