Swollen Glands

I feel like every other month I am getting some sort of cold. I work with the public and money so I know that my chances of getting sick are great. I went to the doctor about a month ago to get a check up because I had a severe sore throat which ended up to be Strep. I was put on antibotics and felt better immediatly. I was given a blood test for HIV and that came back negative. But now I feel a sore throat coming on again. My eyes are watery and my nose stuffed. Could there be something wrong with me again? Should I get tested for something else. I feel run down all the time.