My hubby (a veterinarian :) wonders if you've ever been placed on doxycycline? He also wonders if you live in an area plagued with several tick diseases, such as ehrlichia (caused by rickettsial bacteria). Any joint pain and or swelling?
Well, I am out of my league with this one, but I'll throw a couple things out there.
What you are having with the incredibly high white counts is often called a leukemoid reaction where the baone marrow pumps out huge numbers of white cells, both ones that are mature and ready to be relaeased and also immature ones.
Leukemia is always the first thought here and that is why you saw an oncologist and had the bone marrow test.
Bacterial infections rarely reach white cell numbers this high, so I wouldn't consider a sinusitis either. Having an extra one or missing one (me) is not unusual.
In my experience I only came across leukemoid reactions a couple times. They can be seen in infections with more unusual things like tuberculosis. In fact, TB is usually my first thought. With the chronic headaches I would want to rule out a TM meningitis.
I have also heard of leukemoid reactions occurring in spirochetal infections like leptospirosis, a Clostridia difficile infection in the intestine. Some case reports implicate the Epstein Barr Virus as a possible offender in the leukemoid reaction.
I just read about a cutaneous (skin) form of the reaction with a hypersensitivity to a drug. The drug in question was phenobarbital, but can occur with just about any drug. The diagnosis in this case was made from a skin biopsy. I have found them reported in several other anticonvulsants. Other drugs with leukemoid reactions associated with them are:
Acetaminophen
antihistamines
hydrocodone (Vicodin)
antibiotics (penicillins, sulfa, minocycline)
Then several other forms of cancer can also be associated - solid cancers as opposed to blood cancers. Again, the oncologist would/should have considered this.
Then there is the genetic (I believe) WBC anomaly that causes sky high white cells called Pelger Hewitt cells. But, the lab usually picks this up. A good hematologist should pick it up also and oncologists are also trained as hematologists.
When ruled out a form of leukemia (there are several) the oncologists usually tests for the Philadelphia chromosome that is highly associated with one form of leukemia - That was hopefully done.
So, my only advice would be : possible next steps would be 1) stool culture for Clostridia, 2) a referral to Infectious Disease to see if you have a weird infection, 3) biopsy of the rash, and 4) consideration to dropping your meds one at a time to see if this is a drug reaction.
I hope this helps, but again, it is not my area of expertise.
Quix