Low carb can cure allergies

We've been eating low carb for almost two months now and I just noticed that my stuffy nose is gone!   I'm allergic to something - but after 100+ pin pricks, the allergist wasn't able to figure out what I was allergic to.  Since it's more of an annoyance than a problem, I just take benadryl a lot - a lot as in every day.  (My allergist didn't recommend this.  He recommended nose washes which also worked but took more time and were harder to do away from home.)  Today I realized:

• I have not been taking benadryl or even feeling like I need it for over a month now.
• Last night we had lasagna (very high carb) and I woke up with a stuffy nose this morning.

Not conclusive proof but a very good sign that I am mildly allergic to one of the high carb foods that I've cut out of my diet recently.