I too suffer from allergic asthma and GERD.
If you want to manage your GERD, diet is a big driver. Ever since I lost weight and changed my eating habits, I haven't had a single GERD episode and it's been two years.
In my weight loss journey I went through keto, then paleo, now I'm doing 40 days of high carb vegan (for lent) — macro composition doesn't matter that much, what I think mattered was the weight loss itself and eating whole foods.
It's interesting because I used to get GERD episodes from kidney beans or bananas and nowadays I eat impressive amounts with no GERD in sight. I figured that if I am to survive this month on veganism, I have to eat a lot of beans, lentils, etc. I am no longer drinking carbonated beverages, no beer or sodas, so that might have something to do with it. The general idea being that some trigger foods might not be a problem in the context of a healthy diet and a body weight that's close to normal.
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I have allergic asthma and while it's been under control for years, with me requiring no treatment, when I was in my twenties I went through really rough periods, with me ending up in ICUs with difficulty breathing.
I also heard that extensive use of Ibuprofen can worsen asthma episodes and this is what happened in my twenties, however my asthma is nowadays under control, my immune system seems to be working normally and even when catching a cold, I seem to tolerate Ibuprofen quite well.
Just so we are clear, I'm now 37 and my tolerance of Ibuprofen and similar improved a lot since my twenties, so it can go in the other direction.
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For many people giving up on painkillers isn't an option. My wife gets migraines that are so bad it makes her puke.
I'm writing this to say that GERD and allergic asthma are many times manageable with the proper treatment and a lifestyle change.