After the swelling goes down, you should feel better. The sting sites are generally sore for a few days, especially when the swelling is at its peak...swollen joints are tough to move. Eventually you will develop an immunity to the venom, so the swelling will be limited.
How much smoke are you using? There's a line between too little and too much. perhaps you're smoking too heavily. Also, if the hive is disturbed frequently, either by you or a nighttime intruder (skunks, kids with rocks), they will become more defensive. If you see scratches on the landing board, you probably have a skunk.
Requeening, while somewhat slow, will reduce the defensiveness of the hive in a few weeks once the new queen's offspring populate the hive, assuming they are defensive by genetics and not some outside influence.
Regarding your stores, July and August are often times of dearth, so the bees will consume a great amount of their stores during these months, especially with the population so high. keep a close eye on how much food is available, and supplement if necessary.