I would hold back on panicking at this point though fully appreciate that is easier said than done. I don't believe GERD in itself causes elevations in lipase/amylase but it can be a risk factor for pancreatitis which would cause blood abnormalities. It's possible you could have low level pancreatitis without all the dramatic symptoms that acute pancreatitis would cause. Sometimes it's an autoimmune condition. Pancreatitis can also produce pseudo cysts. Given you've had past elevations it's possible what they are seeing is an inflammatory process as mentioned. In the last decades, imaging has become much more accessible to people and more and more of these incidental cysts are being found. It is rare that they will change into something with worrisome features. Monitoring these cysts is one of the only tools that doctors have to try and catch lesions before they develop into pancan, despite the low incidence of that happening. You can learn more by searching incidental pancreatic cysts and if familiar with medical terminology follow your keywords with google scholar. I've had several EUS and outside of missing my morning coffee, they were pretty much a breeze. I'll cross my fingers you'll get a positive (relatively) report.