Can worrying too much and anxiety cause nausea? i have ocd and fear of death and hypochondria and i'm constantly feeling nauseous which worries me

Yes: Nausea can be a symptom of anxiety. I hope you are working with a good therapist.

Anxiety shows itself: In may ways. Once can mentally obsess over things that frighten the person or do behaviors to keep danger away, e.g., ritual behaviors, checking and re-checking. Physically there can be heart palpitations, shortness of breath, sweating, sleeplessness, etc. Please go to a mental health professional for support if you think you have an anxiety disorder. Consider seeing.a prudent spiritual leader