Sorta like that, when the blood fills the lungs it tends to over flow your lungs but when you exhale it opens the air way and lets it out but from then on it keeps flowing and you have a hard time breathing. Kinda like when you feel like your heart has been split into two or shadered or crushed, ya get that feeling your in pain and all ya want to do is fall over in pain also there are times you have a hard time breathing, like in shock. this normal happens wen your emotionally unstable and someone you care about hurts ya very badly (heart breaking or back stabbed). some people tend to make their self throw up, not on purpose(your nerves are shot so you body stresses out and tries to get rid of the stress) and that can cause blood to pour from you mouth.
now this normal only happens to people who are emotionally or mentally unstable, or if the have a huge imagination that can get cared away. its happend to me so i decided to draw how i feel when people hurt me.(dosen't happen all the time)