Mrseve,
I'm sorry to hear that your test was negative, but Lyme and the other tick-borne infections are notorious for false negatives, and as Springsjean said, the ELISA test is pretty much useless.
You live in Europe, right? If this is a roadblock to your getting treatment, then I would suggest that you turn to natural treatments to rid your body of these infections. Can you get in to be seen by a Naturopathic doc? of a Chinese Med practitioner? They can help. Another line you could pursue is doing an at-home treatment from a reputable LLMD like Dr. Jernigan or Cowden to name a couple.
Here is a link that resides in the "new to Lyme?" thread for some of the natural treatments:
www.lymediseaseresource.com/Protocols.html Hope this helps a bit.
Trav