Why am I feeling so dizzy, nauseous, and exhausted?

About four weeks ago I was diagnosed with mono. A week ago, I was put into isolation at college because I had come down with the Swine Flu. After a week in iso, I expected to feel better but I never did. I've been doing nothing but resting and I cannot shake this overwhelming dizzy/nauseous feeling. I was told that it was due to my immune system working double time and being extremely weak from both the mono and the H1N1 but I'm not sure if I believe that is the only reason I've been feeling this way. The severity of the dizziness comes in waves and I'm so nauseous that I have no appetite. Also, whenever I try to eat it causes me to feel like I'm going to projectile vomit everywhere. Does anyone have any idea what this might be?