It does sound like you are having panic/anxiety attacks. Especially if you don't notice this feeling when your mind is busy. Most likely what is causing these attacks are imbalances in your body. A good thing to try is "Natural Calm" or Cal/Mag. Both of these can be found in your local health food store. How is your sleep? How long ago did you give up smoking and drinking? Lack of sleep could cause some of these symptoms also. If you just recently quit smoking/drinking, you could be detoxing. Drink plenty of steam distilled water. You also may want to look into some of the other forums here on curezone as what you have described could be several different things. I would recommend the parasite
forum, the Candida Forum
and the Bowel Cleanse Forum
. There is a lot of great info in those forums that may be able to help you. Another great source of help would be http://www.askshelley.com/forum/index.php.