I think I'm starting to understand why you are so scared of needles... you get yourself all worked up and tensed up so they're much more uncomfortable than they need to be. I used to be the same until very recently. Two straight weeks of getting stabbed got rid of that in me

I know it is much easier said than done, but try to relax, the needles don't hurt as much if you are relaxed.
You've had plasma exchange before, you know how much better it will make you feel when you're done. Try to focus on that. IV Antibiotics sucks but again it sounds like you're going to need it to get past this bump in the road.
Vent all you need to and don't bottle your fear up but don't let it overcome you. You'll get through this just fine Erin.
Cheers,
Brian