Random bad taste in mouth. got worried it was a symptom of something bad (health anxiety). after, i developed really bad dry mouth and began shuddering like i was freezing for about 10 minutes - was able to stop it briefly by tensing up. anxiety?

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity at tolerated.

Anxiety focused on: health issues suggests a POSSIBLE phobia or Obsessive Compulsive Disorder. Please see a mental health professional for diagnosis and treatment. Please don't use medication only. Therapy can be more long-lasting and empowering. See doctor first. Peace and good health.