What Causes Frequent Cold And Pressure In Head And Eyes?

Hi, I am a 26 year old woman. I have had frequent blood tests over the past 18 months to check my ESR levels. The highest level i have had is 69mm/hour, but mostly it has been 42mm/hour. I also had one blood test with a slightly low WBC of 4.1. My doctor is stumped, he has said that maybe the levels are normal for me and just to leave it alone. I feel very tired all the time and don't have much energy. Recently, i have been feeling spaced out and struggling to concentrate at work and getting mixed up and making mistakes. I also keep getting colds, I've had 3 in two months recently. When i have a cold i get pressure at the front of my head and in my eyes and nose. Do you know what could be wrong with me. Thank you.