Ok it's true I'm an IDIOT

Yesterday I was just moving a potted plant out of the sun and set it down close to a cactus. I felt a sharp sting and thought I had brushed the cactus with my hand. Turns out that is not what happened.
a few minutes later I looked at it and it was getting nasty looking little blister like bumps all around the wound. It was itching like crazy! I put peroxide on it and you would not believe the foam!
Today the wound is much bigger and it's swelled up. SPIDER BITE! blah Blah Blah. I am pretty sure it would have been a white tail by the symptoms but I never saw the spider. I'm treating it myself unless it gets worse then it's off to the hospital. =(