Last fall and this fall I had the same symptoms that my doctor could not figure out. Namely, I got weaker and weaker every day until I was completely bed-ridden. This fall when it started i noticed I had bad post nasal drip, chest pains (tightness) and breathing difficulties and severe shortness of breath. Can allergies and or chronic sinus infections make a person so weak and fatigued that they can not function normally? My doctor gave me an allergy shot and it alleviated the symptoms to a degree. Also, sometimes at night I will wake up because I cannot breathe and its not a panic attack because it is already happeneing while I slee and that causes me to wake up. could I be having an allergic reaction to something?