Wow, Troy,
That is some good swelling for a snake that is only supposed to have a "toxic saliva". LOL.

It is highly umlikely that those tiny rear fangs were able to puncture a vein (even rattlesnake bites/fangs rarely hit the vascular system) and hitting a nerve would not compound the reaction. That little guy just juiced you up with everything he had. LOL. That will teach you to stick your middle finger up at that little tough guy again. LOL.

Thanks for the report Troy. Should post that on FB for the non-believers.