I've been feeling under the weather for about three weeks now. Just feeling a little low on energy and I'm not up for the things I'm usually up for, even if I go for a very short run, I feel quickly out of breath which isn't normal for me. Whenever I start to feel a little bit better, the next day I'm worse again. Last Friday I was feeling very dizzy and couldn't do much else then staying in bed. Monday I felt great again and today (Wed) I have a blocked nose. Is there anything I can do?