I had a tick behind my knee it had bit in = on 5/25 - (Sun). On Wed. I was nauseated - so I went to the doctor - she did a blood test and put me on doxycyline. The blood test came back negative - a week later I went back still nauseated. Further bloodwork showed pyloric in my stomach - I took a 14 treatment of 8 pills per day. On the sat. morning after finishing -my stomach was hurting and still didn't feel good went back and she said the antibiotics probably caused an inflammation in my stomach - take nexium - if it keeps on probably have to go to the gastro doctor. I did Thursday he said he thought it was IBS - (I do have that) wrote me a prescription for Bentyl. Yesterday my stomach felt pretty good. Today I am just totally nauseated again - could this pertaining to the tick?? and today (Sun) also - doesn't this sound like more than IBS??