What Causes Dizziness And Shortness Of Breath?

Last weekend, I felt like I was getting sick (Cold symptoms). I loaded up on C-Packs with Vitamin C and the Immune System version of their packs. I also had plenty of Ibuprofen, Alieve, and Excedrin Migraine to counter bad headaches that I was having constantly. Within the weekend, the Cold symptoms receded. However, since then, I have had moderate aches in my abdomen (Upper left side right below the center of my chest) and I have been unusually dizzy. A strange kind of dizziness, almost like I am spinning. The dizziness happens when I shift.lie down or get up etc. But it also occurs when I am sitting still. The Abdomen pains seem to be getting better, but I am wondering what is going on, because my dizzy spells feel more like waking up from a hangover and less like a shortness of breath kind of dizziness. (No I do not drink very often, but I unfortunately have experienced this feeling). I am a white male, 46 years of age 5 .10 and weigh approximately 220. I recently had a COMPLETE CBC and other blood work done and all checked out okay (Other than my BP was a bit on the high side supposedly due to stress). What are your recommendations?