I have fluid on/off for 1 year on left side lower neck area more so on my collar bone. Thru out the day it fills with fluid.When it fills up it raise about 1 inch in curvice of collar bone meeting my neck. I get very tired when this happens, usually will sleep about an hr after work if the fluid has been present all day at work. meds-estriol very low dose, good health, good weight, no health problems, but usually seasonal allerys/sinus. 55yrs. Work in a sr.high school.