I think my physical symptoms are caused my stress and anxiety. Is this possible?

Yes. It would help to understand what you symptoms are. However, it is true that your brain is intimately connected to your body and they do effect one another.
Stress and anxiety. Yes. A great number of physical symptoms are caused by stress and anxiety. Talk to your doctor about this and get help with overcoming your stress and anxiety problems. Meanwhile try to learn about anti-stress methods, meditations, yoga and relaxation techniques. Google these topics for information.