Shortness of breath when i take hot showers. feels like i'm suffocating. what can be causing this ?

short of breath: There are multiple possible causes for what you describe, you should see your doctor to see what they can determine.

Bronchospasm: Airways are made of muscle tissue. Sometimes, that muscle can tighten up like a cramp - that's called spasm. Bronchospasm is seen when someone has a "reaction" to perfumes, allergies, strong odors or steam etc. You should have a pft (pulmonary function test) to evaluate your lung capacity. Other causes exist. You do need a checkup. There are treatment that would make the "suffocating" go away.