One morning about 3 months ago I was diagnosed with an inner ear infection due to being very dizzy for days. Since my initial bout I have been experiencing several symptoms which include: an overall lightheadedness feeling, tingling sensations on various body parts at times, pounding heart, dizziness due to a rushing sensation to my head, and tightness about where my sternum is. These symptoms are not always present and occur mostly when I am sitting or sleeping. I have had a complete blood test and a Holter monitor and all tests were negative. I work out 3 times a week, am not overweight, do not drink alcohol, have 1 cup of coffee in the morning, do not drink soda, and eat a well balanced diet. I am not happy with my current physician (HMO) so I am looking for some advice on what this could be. I am starting to get paranoid about having some weird illness due to being only 39. Can I rule out things like MS, Parkinson's, brain tumor, etc.. Please help. Thanks!