I am a healthy 67 year old who has had multiple tests wrong but am always thinking something is wrong with me. whenever i have diarrhea i think of the worst. same with everything else. what is wrong with me and why can't i just settle down and know?

Find a life coach/therapist who can teach you stress reduction/relaxation skills. During the training you may uncover a hidden stressor(s) that is really the issue. Health anxiety is often a feel good coverup for anxiety producing fears you cannot face. Do the work & life can get better without meds. Do nothing and you will remain in this circle of problems.