The stress you feel about seeing the doctor can be only be relieved by doing it. Have a schedule. Plan your work, your play, and your relaxation, so you'll be sure to find time for all three. Improve your communication skills. Learn to say what you think and to really listen when others speak.
Communication relieves stress.
If you're the kind who always says yes, learn when it's time to decline. Keep a smile on your face. Learn new skills. The antidote to worry about losing your job is to make yourself all the more valuable. Manage your weight.