Sounds like bronchial spasm in the lungs. Lungs can not open and deliver oxygen to the blood, so you are tired and your heart hurts a little too. I would think that is your asthma acting up. You can ask a pharmacist for something over the counter, but you should see your doctor. Asthma can be aggravated by pollen and dust outside, or dust inside, too. A thorough complete cleaning, vacuuming, dusting of your house or apartment is a very good idea. Also, clean air filters for the A/C. Its possible your carpet pad is severely detiorated and dusty, if it is very old. You can also run a good HEPA air filter in the house too pull allergens out of the air.