I'm 28 and about 50 lbs overwheight. I've been on a diet and exercise routine for 2 months. The last week i've been getting shortness of breath,fast heart rate, and lightheaddedness. I get these symptoms by, singing,yawning, gettin up to fast, and fast walking. I went to the doctor and bp was 140/80 i think. He thought possibly that i was not eating enough and drinking water . I did have a small fever, maybe i have a virus thats showing this way? I do have an anxiety disorder, but never experienced these type of symptoms. Any advice would be great.