I've been having these spells of losing my breath without being active at all, mostly just when I'm watching tv. I will start to feel like I'm breathing into a plastic bag, I'll start sweating, my heart will race, and it will just become harder and harder for me to breathe. This will last for about 2-3 minutes more or less. This has been going on now for about 2 1/2 years, my chest just feels tight and painful when this happens, I will also feel very dizzy and scared. This also happens when I take any type of over the counter sleep aid or allergy medicine. I've asked my doctor, he's never seemed concerned nor given me a direct answer or any type of explanation, I'm only 21 and I have a 4 1/2 month old son, I smoke a half a pack of menthol cigarettes everyday. It has been happening more often recently, and I spend 4 days a week at home alone with my son, please help me.