Hi all-
As I've been reading these posts, I've been hearing a lot of unanswered questions about blood work - ask your doctors!!! Ask even before they take blood work, and utilize nurses. Call the office and say you'd like to talk about your results, etc. Ask what they're thinking as their next plan of action or what they think the results could mean, etc. Don't feel bad for asking questions, it's better than sitting on the computer thinking of the worst scenarios.
Second, a quick explanation for those who need it. White blood cells are basically your cells that fight off infection - a big part of your immune system. Low counts can mean you're more susceptible to infections, including getting colds, the flu, bacterial infections, even an infection from a scratch, etc. That being said, the normal adult range (depending on different sources or hospital facilities), is usually 4.0-11.0. If you haven't had your WBC taken previously and find it's 3.5, don't panic! Some people naturally have a low WBC, have always had a low WBC, and will always have a low WBC - it doesn't mean your immune system is compromised or you have cancer. It should be checked out, followed up on, but keep in mind that this is a possibility (especially if you feel fine and are not experiencing any symptoms, or increased infections, etc).
Another thing to look at is your other blood work. If your RBC (red blood cell) levels are normal (especially hematocrit and hemoglobin), and platelets, you likely have a virus or are fighting off an infection, or normally run low with your WBC.
Miscellaneous other points to answer some questions:
Topamax takes some time to work for headaches. It's a prophylactic medication, which basically means it slowly builds up in your system to prevent the symptoms, not treat them. So think weeks, not days, for the topamax to start working, if it will for you.
Lupus usually does cause a low WBC, as many autoimmune disorders do. If your body attacks its own cells, WBCs are not exempt from the battle. They're basically attacking themselves. Especially if you're on immunosuppressants - which literally would lower your WBC to the extreme, expect low, low, WBC levels. If you stop the immunosuppressants to recheck WBC levels, I would expect to need to wait longer than a couple of weeks for your cells to rebuild to a significant level (WBCs have a life span of 13-20 days), especially in a patient with lupus.
Overall, don't worry until you have to. The benefit of having a low WBC level as opposed to others is that a low WBC by itself is usually not symptomatic, unlike iron, for instance. The nuisance is that many times finding the cause is unknown - but often it is a fluctuation. Ask questions (!!!), DON'T worry without real cause to (serious symptoms/a diagnosis), and good luck!