Oh wow! Those bites can be awful! Good that you recovered!
Good idea to keep spraying... what product are you using?
My personal choice, if I have one, is Hot Shot, but I usually put diatomaceous earth down in the apartment when I first move in and that takes care of any insect problems. I just didn’t lay down another dose of it the following year.
I think commercial insect sprayers mess with the stuff because when they spray, you always see critters. With the earth, they walk through it clean themselves and each other and die. My kind of pest control!