I had it. I got a deer tick on me, and lo and behold, two days later a bullseye rash. I went to the doctor. they tested me for lyme disease and I came up negative. then they told me that tests don't always work. I told them to give me the antibiotics now before it got worse.
the crazy thing is I actually had to work hard to convince the nurse to give me a prescription. my point was, better safe than sorry. seems pretty reasonable to me.
I didn't want to go through what my friend went through at beach week. he was lying on a couch saying in his southern accent "guys, I'm really sick! I need to go to a hospital!" but we all just thought it was alcohol related and told him to sleep it off. I still feel bad about that. when he got home he found out the bad news. he's fine now though.