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In this episode of The Gut Health Dialogues, Alyssa Simpson sits down with Dr. Diana Driscoll—optometrist, researcher, and author of The Driscoll Theory—to uncover connections between gut health, vagus nerve dysfunction, chronic inflammation, and conditions like POTS, SIBO, long COVID, and Ehlers-Danlos Syndrome.

Dr. Driscoll shares her journey from being incapacitated by illness to discovering root causes medicine often misses. She explains how vagus nerve dysfunction affects digestion, motility, blood flow, and brain chemistry—and why real healing goes beyond symptom management.

Key topics:

• Why vagus nerve dysfunction is the “missing link” in gut and autonomic issues
• The role of histamine, inflammation, and oxidative stress in driving symptoms
• How POTS, SIBO, EDS, and long COVID overlap through nervous system dysfunction
• Upper vs. lower GI motility—and why both matter for SIBO recovery
• Hopeful starting points for those living with chronic illness

Dr. Driscoll also shares practical strategies, including how supplements like Parasym Plus® and NAC Max (links below) can support vagus nerve function, brain chemistry, and overall healing.

This episode is a must-listen if you’ve been searching for answers to gut issues, unexplained fatigue, POTS, or connective tissue disorders and need validation that you’re not “crazy” or alone.

Resources Mentioned:

• Parasym Plus® (use code GUTHEALTH10 for 10% off)
• Follow Diana on Instagram
• Dr. Diana Driscoll’s Website
• POTS Care Clinic
• POTS Rebels Patreon
• The Driscoll Theory Book
• YouTube Channel

Guest Bio:
Dr. Diana Driscoll is an optometrist, researcher, and founder of POTS Care and TJ Nutrition. Known for her pioneering work on the vagus nerve and autonomic dysfunction, she authored The Driscoll Theory and developed targeted supplements like Parasym Plus®. Her work bridges the gap between science and patient care, offering hope to those with POTS, SIBO, EDS, long COVID, and chronic inflammatory conditions.

Find Alyssa here: 

• Instagram, LinkedIn, Facebook, Pinterest   
• DM “GUT CHECK” on Alyssa’s Instagram for a personalized quiz and free meal plans & resources to kickstart your gut healing journey.
• Check out Alyssa’s FREE Masterclass “Why your gut still isn’t better. 

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If you’re enduring uncomfortable, painful, and embarrassing GI symptoms and feel like you’ve tried everything, Alyssa uses a specialized approach to help people who’ve gone from doctor to doctor finally find relief. Book your 15-minute strategy call for FREE here.

Join Alyssa’s FREE Facebook Community here.

The Gut Health Dialogues drops new episodes weekly to help you uncov