Donuel
There is a non medicinal method - adrenaline.

How you invoke the adrenaline is up to you. Shouting will notch it up a little. One of the reasons we shout when in pain, the automatic reflex produces yet more adrenaline, yea, yea, it attracts help too.

I well remember in a festival w/e singaround with an absess under a tooth with no recourse to a dentist, being in pain waiting for my turn to sing. Which when it came, after 3 minutes I realised there had been no pin for the last 2"59'. If that is not adrenaline then what? yea, yea distraction, but to a lesser extent.