There is a test for Lyme. It is not that expensive. However it is not that great and has a lot of faulse positives what my doc told me. The next test is really expensive and not covered by most insurance. It's more reliable but has some issues.
Part of treating fibro is ruling out the Lyme' s Disease. The treatments are different. It will be helpful to have Dr. order the test. Refer to Fibro Manual by Dr. Minerva Liptan MD. DR can go to her web site.