You might want to get your electrolytes periodically checked. What are you doing for treatment now?

I’m only on propanalol

Drink a lot of water, more than what is recommended for the average person. Electrolyte drinks/supplements can be good. Seated exercise like a row machine, stationary bike, or yoga can help. Staying away from hot baths/showers unless you have access to long rest times (ex. right before bed) as it can make symptoms worse. Compression clothing, I wear socks. Some people find low FODMAP or low carb diets help but that’s on an individual basis and I only recommended that if that’s something you want to look into. Otherwise checking your heart rate or blood pressure at home if you can is a good idea so that you can keep track of it for your doctors in case you start to feel worse