Seconding that there's a lot of wiggle room for allergy shots, but in terms of like, severe allergies, I had four shots every week for, oh, idk, four years? Five years? (Until they said that shots probably weren't doing anything more for me, and we could revisit it in ten years. And then I immediately felt the lack of no shots the next month and it sucked.) And every time a new nurse was in I had to go through the rigamarole of, "you have to take that many shots?!" Most of the people in the waiting room were only getting 1 or 2 shots, and they were either getting them per week, every other week, or per month. For those of us who had to take shots every week, if you missed a week you missed a week. There was no point getting it rescheduled, just come in the next time. (I imagine that if they were only getting them once a month they might have gotten it rescheduled, tho.)

Also seconding that if you're taking allergy shots, you're probably taking antihistamines on the regular. Possibly multiple antihistamines. And they could definitely bridge the gap between the next scheduled shot. Like, it wouldn't be fun if you walked through a cloud of allergens, but you could hack it. (Hot showers might also feature regularly.)

It's the sneezing his head off thing that strikes me as weird, tbh; like, I get that sneezing is a symptom, I have it too! But that's not what tells me that I'm having an allergic reaction. It's everything else that tells me allergens have landed: tight throat, itchy eyes, clogged sinuses, general miserableness, and a migraine if I'm really lucky.