Hi Leah, I'm sorry to hear about
your daughter. I think it's ok to be on abx with the igenex WB. The main problem is if it is a recent infection and someone starts abx then the antibodies might not be produced. But if the infection has been around a while then I think it is inconsequential to be on abx, in fact I think at that stage abx can help provoke an immune response which can be helpful for the test. Hopefully others chime in on that issue in case I'm wrong.
Squished head/head pressure always makes me think babesia.
In case it can help I include this link outlining what the bands on the lyme WB represent:
http://lymetwistontherocks.blogspot.com/2011/01/western-blots-what-do-all-of-those-darn.html