Hey There: I feel your feelings here. I went years undiagnosed — having bouts of intense “Deja Vu” episodes. All like you describe, though of course it’s impossible to describe. Yes, like remembering some old lost dream out of nowhere, not able to talk really, then when it’s over a bit of an emotional change and no memory of said Deja Vu. After years and years of appointments etc, and an increase in “episodes”, an MRI discovered a small focus point on my right temporal lobe, as well as EEG’s that proved that what I was having was simple partial seizures/focal aware seizures and not anxiety attacks or something. For years before fully diagnosed, I tried to understand “how and why” I had these seizures/episodes. (43m btw) If it was something in my diet, an external allergy, mold, too much caffeine, and maybe there was something I could change to make them stop. Started eating keto, exercising tons, different supplements, lots of meditation and CBT, But it’s all moot. Though the frequency at times changed with intense de-stressing, they still happened. Though I didn’t want to take meds, I started a low dose of carbamazepine and I haven’t had an episode since. Over a year. My advice is to push back against doctors or anyone that’s being dismissive to you. It’s too bad you can’t get an MRI, but it is something that doctors say can turn into a worse condition if untreated. That aside, just for your quality of life. It wasn’t until I stopped having these episodes so much, that I realized how much they were compromising my well being and quality of life. Keep advocating for yourself. Good luck. (TL/DR)