I have the same issue with migraine auras since my PFO closure surgery using the Gore Helex device. But my surgery was done a year ago this month and I've been experiencing migraine auras in addition to constant shortness of breath (even at rest), chest pressure (like a chicken bone stuck) and burning pain in my chest along with fatigue (all of these symptoms started two days after my surgery was done).
I've seen two interventional cardiologists who don't think anything was wrong and have poopooed my concerns too. But because I know something is wrong and can't continue feeling crappy, I've done my own research and have found something very relevant regarding the symptoms of nickel allergy and the device, that is discussed in a journal article from the American College of Cardiology. The reason for concern about a nickel allergy to the device is because the Amplatzer and Gore Helex devices have metal in them called "Nitinol" which is made of 55% Nickel and 45% Titanium (it helps the device keep it's shape). I included the link to the cardiology journal article below if you'd like to read it:
In the article they discuss in detail about the symptoms of migraine headaches with aura and abbreviate it as "MHA". It seems the patients who were seen in this study, those that started to have migraine headaches with aura (MHA) after ASD/PFO device closure (who didn't have migraine auras before) have a high probability of a nickel allergy to the device, and patients with a combination of migraine headaches with aura (MHA) and chest pains have an extremely high probability of nickel allergy to the device.
Just some interesting info to think about if your symptoms continue. And since mine have continued for a year since my PFO device closure, I'm now seeing new doctors to get tested for a nickel allergy; and if it turns out I am allergic to the device, I'm probably going to go to the UCLA Heart Clinic or the Cleveland Clinic to have the device removed.
I hope this info helps. Good luck on your journey!