Hi Meg,
You are absolutely right. People need to be cautious about doing exercises that are safe for their personal bodies. There is a warning on all of Dr. Mandell’s ( He is a Chiropractor) videos to caution watchers that says:
THIS SHOULD NOT BE USED AS A SUBSTITUTE FOR PROFESSIONAL DIAGNOSIS AND TREATMENT. PLEASE CONSULT YOUR HEALTH CARE PROVIDER, BEFORE MAKING ANY HEALTHCARE DECISIONS OR FOR GUIDANCE ABOUT A SPECIFIC MEDICAL CONDITION.

I hope you feel better soon.