I had (have) an undiagnosed gluten allergy, and had similar issues for a couple years until I tried cutting wheat and other sources of gluten out of my diet and felt like a normal human being again within two days.
You have to be careful with suggesting to cut out X/Y/Z foods. Said another way, I would recommend OP eat a bag of gluten and see if they end up in the hospital you'll have your diagnosis in 15 minutes and then there'd be no argument.
I'm not speaking about you specifically, parents get the cutting out X/Y/Z food wrong with their kids all the time. It makes people afraid of eating instead of afraid of what they're allergic to. Unless you maintain a strict food journal which I don't have time for why not just take 2x dose of Zyrtec (I'm just a happy customer) for a week, then try the gluten/paleo/soylent/steve jobs diet.
Edit: I am not a medical doctor and taking an antihistamine to mask a food allergy is probably dangerous but I'm still testing myself. OP said they tried Dramamine, which is an antihistime. I've taken that along with many antacids including Nexium and Pepcid which are also antihistimine. Maybe mast cell disorder is what doctors have to call it so someone with a peanut allergy doesn't read this and reaches for zyrtec and a bowl of peanuts and throws out their epipen. That's why I mentioned the pollen cross-reactivity because I think my body is just overreacting so I'm making the executive decision to suppress it. It's been 8 months or so, I've not taken a single Nexium, only a couple pepcid which for my family is basically cured. I moved somewhere with less pollen because I don't like taking pills all the time.
Edit-Edit (I'm really focused on this topic lately): The bottom line is that I reduced my cetirizine use from 15–20 mg/day to about 5 mg/day by moving to a place with less pollen.
If you're experiencing something similar, pay attention to any systemic symptoms and listen to your body. I had eliminated almost all food from my diet to control my gastric issues. But my left ear was having tinnitus. They checked it, they said my ears are very clean and thought it might be middle ear problems. They gave me a list of antihistimines and a nasal steroid (flonase) to try. I channeled my oppositional energy and thought, "Well, if they want me to try it…"
So I bought the entire list they gave me, I took cetirizine once a day, loratadine twice a day, and occasionally a fexofenadine pill (along with my usual double dose of Nexium, which I was desperate to discontinue) plus the Flonase for good measure.
I started cetirizine to manage tinnitus and dizziness, which are entirely separate systemic symptoms that I had never associated with my gastric symptoms or food.
A few days later, my ears cleared, and all my gastric/reflux symptoms disappeared. I quit all antacids on the same _day_. When my middle ears drain, that's my canary in the coal mine. It had worked so well that I wondered how long I had been suffering before I moved to Pollenville in the first place and just didn't notice.
Thanks Pollenville. You were my bag of raw gluten powder.
