Your WBC count did not decrease until after you started the Doxycycline. I personally think there is a connection between the medication and your low WBC count. If I were you, I would not worry about
your WBC count unless it goes below 2.0. I've had mine as low as 1.9 and yet I did not get the flus & colds that were going around at the time.
One thing you might want to think about
is taking Cat's Claw - it is known to help reduce inflammation and boost the WBC's that are needed to fight Lyme bacteria (CD-57).
The body needs protein, fatty acids (fish oil), vitamins & minerals to make WBC's. If you aren't already doing so, I'd recommend adding a daily multi-vitamin/mineral supplement because this will help fill in any gaps caused by your decreased apatite (also a known side-effect of Doxy).
Also, it might do you some good to consult an acupuncturist - this can help your spleen, improve your immune system & energy level, and reduce anxiety (among other things). I always felt better after a good acupuncture treatment...
Chronic Lyme Disease, Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, Pancytopenia, chronic malabsorption/malnutrition, etc.; G-Tube; Currently TPN-dependent.
Meds: Zofran, Pulmicort, IV Ceftazidime, Heparin (to flush PICC line), Claritin, Colloidal Silver (used topically), probiotics, homeopathy.