Signs. Several late signs of fluid overload include severe edema (swelling), high blood pressure, decreased hematocrit and hemoglobin and pulmonary congestion.hen a person has an overload of fluid in the body, the fluid builds up in places it's not supposed to be. Symptoms of pulmonary congestion include difficulty breathing, excessive sweating, a feeling of drowning, gurgling sounds when breathing, pale skin, shortness of breath and wheezing.