I agree with those that say to see a doc.
My understanding (and I'm no Doc) is even the red local swelling is a reaction to the venom.
So you are evidently reacting and it just becomes a matter of how much.
I've been stung any number of times over my life. Once was out digging some stumps with my hoe and was stung about nine times. Was either 5 on face and 4 on arm or other way around.
Regardless, my face was puffy for a week and ached. (I'm sure it still pains my wife to look at it

)
Fast forward a couple years and in LATE November, a lowely little wasp was very lethargic (cool weather) and climbed up my sock....stung me on the calf.
I ended up in the emergency room with several syringes of "stuff" being pumped into me via an IV connection.
My airway was constricting, my entire body was itching like a real SOB.
I ended up going to an allergist and went through the 5 years of treatment.
As it turns out in my case, I'm allergic to all the little stinging critters now. The LOWEST reaction I have is to wasps & bees. Yellow jackets & Hornets are off the scale for me. It was a lowely wasp that landed me in the ER.
I've since been stung by a yellow jacket. The moment it happened I remember saying something like "here we go... it's test time" (to see if the process was helping)
I went inside as per my Doctors orders. (stay cool)
I also went to the cabinet and took a couple chugs of liquid benedryl (only found it as Childrens Benedryl......cherry flavor of course!)
and I kept my epi pen handy as well as phone.
After an hour of nothing..... I concluded that I was not going to have a reaction like I had before.
Reported the story to the Doc at my next appointment and he was pleased to hear how it responded.
So I went from no serious allergic responses to landing in the E.R. after being stung by the least reactive offender. Had I instead been stung by a yellow jacket/hornet, my story might have been different.
I now keep an epi pen at home and one at my work. I'd keep one in my car but I understand they don't hold up well in heat.
Much like car insurance, the time to get a checkup to have any allergic reactions measured is
before you might have another episode....not after.