WOW! What a friggin' story! The irony here is unreal. Sort of like Steve Irwin!
Anyway, you also mentioned alot of swelling ("football size"). Could be an abcess (deeper) as well as cellulitis (superficial). If it returns after the antibiotic is finished, or doesn't turn the corner, you should request 2 things:
1. An ultrasound. Wood and wood particles do NOT show up on x-ray and often will not show up on other more advanced imaging like MRI.
2. A consultation with a surgeon. Your standard general practitioner is not someone who should manage any sort of more advanced, recurrent or resistant infection.
Keep us posted and always feel free to pm me.
Freaker