Hi @anet, There is another discussion started by @bumble81 who mentioned having postprandial hypotension here - Digestive issues, weird sensations: https://connect.mayoclinic.org/discussion/digestive-issues-weird-sensations/. @stefspad, @elizabej and @bonnieb81 have mentioned postprandial hypotension in other discussions and may have some thoughts or experience to share with you.

You didn't mention your husband has any abdominal pain after eating but I thought this article sounds similar to what you describe is happening after your husband eats a meal.
""Can low blood pressure cause abdominal pain? — If you feel abdominal pain and dizziness after eating, it may be because your blood pressure hasn't stabilized. This sudden drop in blood pressure after a meal is called postprandial hypotension. Normally, when you eat, blood flow increases to your stomach and small intestine." — What's Causing My Abdominal Pain and Dizziness? – Healthline: https://www.healthline.com/health/abdominal-pain-and-dizziness.

Hoping his cardiologist can find some answers at your husband's appointment this week. Are you able to provide an update after his appointment?