Thin air
could blow me
to dust

this is so heart-breaking and very emotional but I like it :)

I like the short lines - they portray the sense of anxiety and diffusion of energy.
You may want to correct the non-ASCII in the first stanza: heartÂ; also, unless it was deliberate, you might check on
"Weaker an weaker" Should it be "and"?

Again, the tension and emotional charge is strong and compliments the substance. Nice work.