What Causes Weakness And Shortness Of Breath?

For the past month, I’ve been weak. It started the second week of April. Maybe the third. But we haven’t had enough food, and I used to eat a lot. But slowed down really quickly. I begin to eat less and I became weak and when I was hot I’d need to take deep breaths and I’d get light headed. A week later it remained the same but I started cleaning for my sister and pushing my self when I needed to relax. Causing everything to triple. My body started aching, I’d get light headed even when sitting or not hot, I can hardly breath. Now I’ve gotten a cough and when I breath it burns my upper back and chest. Just today I’ve gotten a burning sinsation slightly above my right breast. I forget easily, I won’t talk to no one or “act interest”. Because people tell me I’m fine. I’ve been weak and breathless and light headed. Achy. My period was really watery as well which was unusual. I’m worried. Could you help give me an ide of what this could be?