Help with symptoms (not pregnancy)

Lately..maybe like 3 weeks, I've been getting really light headed whenever I eat, I didn't think it was a big deal until the last couple of days, I've been coughing so hard, it hurts my chest and back really bad, it brings me to tears, my chest feels like it's caving in.. this could be separate from my light headedness. Can anybody help me with figuring out what's going on and remedies for my chest and back pain?