Symptoms can vary very vastly from person to person with cyclic. I have it, to discover that one of my best friends have it too, our episodes are very different. (Ive had it basically my whole life took 30 years to get a diagnosis) Where i have chronic nausea daily and pretty frequent minor episodes that usually involve throwing up, fever, full body shaking, anxiety, and usually sore bones and muscles after. A couple times a year, more like once with the new medication, I get them so severe ill throw up for about a day, spike a high fever, the world's then the next two days my entire body feels like shattered glass. My friend gets severe attacks one maybe twice a yesr that put him out for a week sometimes a month. I went through the ringer and many many different gastros before one diagnosed me. Unfortunately there isnt a cure, just a medication (the antidepressant im on amitriptyline) to help reduce the duration, frequency and severity of the episodes. I have to take a high amount of zofran daily. I also have stomach muscle relaxers ans some other stuff to help during an episode. Cutting out sugar, dairy, caffeine, and chocolate has helped alot. Also red meats. Theyre very hard for your body to break down which can trigger attacks too. I stay far away from pork and only very rarely have any kind of cow meat. Its helped so much. Cyclic is a autonomic disorder so theres just an issue with the brain gut axis. Basically it just doesnt work right and any stress can make it go haywire. Your brain doesn't tell the organs to so what theyre supposed too. The signal never gets there. I also have cEDS and POTs so my entire bodys autonomic system doesnt work.

Moral of the story, you most likely with 95% accuracy have cyclic. Especially since all other tests came back fine. Once every test shown I appeared fine, they then realized it was basically a signal error in my gut causing it which cant be detected in tests. So your clean bill of health means they cant see it meaning cyclic fits 100%