m just a patient too, but your symptoms seems to me like possible unstable blood
sugar levels, especially if you get the problems after eating
sugar or high carb meals. Reactive hypoglycemia (blood sugar falls after eating) triggers tachycardia, anxiety, elevated blood pressure, sweating, etc.
This condition is also caused by excess adrenaline in response to low sugar. So is anxiety (elevated adrenaline), so they are hard to differ.