What to do if I have a low wbc (3.6), high lymps (56), low neutrophils?

Recheck in 6 -12 wk. Start with what you had that make your doctor check the wbc. The most common cause of slightly low WBC with a high proportion of lymphs is a viral illness ( which causes the neutrophils to drop). So, as long as your other counts are okay, just wait and recheck in 6-12 weeks. Your doctor likely checked to make sure your WBC was not elevated (often caused by bacterial infection) to be safe.