What Causes Dizziness And Swollen Lymph Nodes On The Neck?

Every time I stand up or walk across the room, my heart rate skyrockets. In Kindred Hospital La Mirada, CA,The nurses and staff were always getting me to lie down or stop physical therapy because my pulse was in the 150s. I also seem to have a sore throat, retention of fluid in both ears, trouble breathing, and when I do breathe after walking just a short distance, I get light headed and dizzy. I have terribly swollen glands especially on the left side of neck. I had pneumonia in the hospital and almost had to get a tracheotomy.