Hi Dawn, I just came across your post. I have been seeing a Hematologist for a little over a year now, it's the best thing you can do. My primary referred me as my blood work came back saying that my WBC was a 3. I got blood work done every month, every other month to 6 months in between now. The tested me for everything under the sun, from anemia, Hiv, Lymphoma, Leukemia, and other blood disorders. All other test keep coming up negative so I am classified as having Leukopenia. Having  Leukopenia is having a consistent low WBC. Yes we are always tired (this was my main complaint to the doctor before he ordered my blood work) and Yes, your immune system is weakened (I've been fighting a cold/allergies for 3 months now, ugh!). I am 45 yrs old, eat healthy and exercise regularly and I'm still tired all of the time. I started some natural remedies to help boost my WBC. I will find out if they are working and report back when I get my next blood work done in March. I wish I had an answer to why I have Leukopenia, I hate the unknown, but Hopefully they will find something soon. I hope that you find your answers and pray that it's nothing serious that's  causing your leukopenia. Best reqards. Kathy