Re: spirometry results
Due to the rules of this board, I can't post where you can find that, but I can tell you that your predicted would be somewhere around 3.2.
In my opinion, I would think that it may not be something that I would necessarily follow up on super quickly. Sometimes it can take a while for your body to get back to normal after an allergic reaction. It could be that it caused your lungs to swell or something. A lot of times asthma can get worse if you don't treat it. In asthma there is underlying swelling and so it can get worse. That inflammation is usually treated by an inhaled corticosteroid (like qvar, pulmicort, or a component in Advair, etc.). These have very little side effects because they're inhaled. You might ask your doctor about trying a medication like that if you're really concerned.
Just FYI, there is such thing as adult-onset asthma and it can come after an allergic reaction to something. Typically, though not always, asthmatics have nocturnal symptoms. I have trouble at night sometimes more than day. Especially if I'm doing poorly, I have those issues and I have to sleep in a recliner.
Another thing you might think about trying is getting a Piko meter. This measures a thing called your peak flow, and most importantly, your FEV1. They run for $25-$30 bucks. You can use that to track your FEV1 morning and night and if you have a certain change between night and morning (I think it's 15%, but don't quote me) or if your FEV1 is more variable than normal (again, could be 15%...) than it is also positive for asthma.
If you, in fact, feel that your doctor might have missed something, don't hesitate to get a second opinion. (And by the way, lol, as much as I like my opinion, I don't know that it counts much for a second opinion...lol)