Lyme disease will mess you up, but if you get a deer tick on you and catch it soon enough they can do some things to treat you. My dad got a deer tick on him while fishing a couple summers back...and they were able to treat it by giving him some pill that he took. He said he felt terrible for a couple of days while the antibiotics were doing their work...but he is fine now. The best thing to do is to check yourself thoroughly after being in the woods.