I ensure I look after myself by doing and believing in the following:
Do your day to day activities.
Go gym, live a healthy lifestyle, stay away from unhealthy foods (easily done).
Surround yourself with family and friends who will help you with your stress and worries.
Trust in Allah, know that whatever you are going through right now, it is a test.
Trust in Allah, know that Allah is the best of all planners, whatever you are going through right now, is best for you.
Keep on praying, keep on making dua, He the almighty hears you.