Seeking Advice on Hypermobility Diagnosis and Second Opinion

I'm so sorry that happened to you, unfortunately that's a very common experience with this diagnosis, a lot of doctors are just not well-informed. I would look into the Ehlers-Danlos Society website. They have a ton of resources and information on there, including how to assess hypermobility and a list of doctors who treat patients with EDS. I would also look up The Beighton Scale. The Beighton Scale has been the standard of diagnosis for hEDS since 2016 (however it's important to note that some doctors and patients disagree with it being the standard and it has flaws, so if you don't "pass" the test, don't let that discourage you. Seek treatment/dx if you're suffering). If you do look up The Beighton Scale, make sure you find the full assessment, it's several parts. There's also a lot of comorbidities (migraine, gastro issues, allergy/MCAS, POTS, ADHD, etc), so I would gather some information on those as well to see if you have any other health conditions that are associated with hEDS. If it's a primary doctor you are going to see, try to request a referral for a Rheumatologist or Geneticist, those are the doctors who typically diagnose EDS disorders and they should be more knowledgeable. I wish you good luck at your appointment! (The alike wisdom response has good suggestions also).