Sometimes there is a "dry bite" where no venom was injected. Then you also have people who react very badly and people who react very well to the bites.
I had a bad bite about 6 years ago and was able to fight it off after a week. The affected area was around an 8" diameter and about 10 degrees hotter than the rest of my body at the worst. Luckily my immune system kicked in high gear around day five and two days later it had shrunk to the point that the doctor knew I would be OK. I have only a small scar (about the size of a chicken pox scar) left on my arm. On the other hand, a man I know was bitten on the leg and lost a golf ball size hunk of flesh from it. (Ironic since he had been a missionary in Africa for 30+ years and had avoided all sorts of deadly creatures there. Moves to Springfield MO and gets bitten by a brown recluse within a week.)
There is no anti-venom nor treatment.
Yours sounds like my husbands. He got a headache so bad he almost cried. He was bitten in his recliner. Two times on the face, once on the neck, and twice in the back of his head on the hair line. Some anit-biotics worked on him. Little chicken pox scars are all that remain.