I have anxieties regularly about once a day always having a phobia about being sick and concerned about creating a scene & hence avoid crowded places.

Anxiety: You must consult a physiatrist to help you in treating your phobias

Phobia: is an irrational fear of something. We get snagged by the very remote possibility that it can happen. Cognitive therapy is very helpful for them. Please see a clinical psychologist. Also use a book called "Feeling Good" by David Burns for some self-help. Peace and good health. You may have a social phobia, which is a specific and very treatable situation.