@danny95 & @susu2 I’m a type 1 diabetic since 1975. I’ve had lots of experience with hypoglycemia over the years but I haven’t heard of reactive hypoglycemia. I have had chronic sinus issues all my life but never made any connection between the two conditions. @susu2, a glucomemter is a blood sugar testing device. You can buy them over the counter and you will also need a lancing device, lancets, and test strips. The test strips are expensive, but the rest of the gear is cheap. Depending on your insurance coverage, it may be better to get a prescription from your Dr. An endocrinologist would be all over that. If you need to find one, you might need a referral from your primary physician. If you use a larger health system that has multiple specialties, you could check there under endocrinologists.