I never feel this much pain...

I...I....*runs away*

Pain killers? I don't know all I can say is go to the doctor. Chest pain often indicates a ハート, 心 problem it sounds pretty serious so あなた should see a doctor soon.

Not everyone here would know the cause for this so....

I'd say you're in a bit of a depression または possibly are suffering from some sort of crash in health due to stress または anxiety that has accumulated in your life.

Take some deep breathes, get away from whatever's bugging you. A nice walk while listening to 音楽 あなた like might help; fresh air is もっと見る beneficial than one thinks.

Use a little Morphine...

Wow, sounds like あなた have a motor neurone disease......well, there is no cure :/
I could suggest Bicom therapy, but they may not have it where あなた live. The only reason I say Bicom, is because I have first hand experiences with it, and it is very effective. Weather it can cure something as bad as that, I don't know. Why haven't あなた heard of it? Doctors are too sceptical, and don't believe in it. But me, my family, and my フレンズ have all had brilliant results.

Well, あなた know what they say: 'An 林檎, アップル a 日 keeps the doctor away, but a doctor per emergency keeps the Grim Reapers at bay."
...Dude, go tothe frakking doctor!