The thing is, some things don't decay, don't break down, can't be reworked or reused. Those things we burn. In yoga we call it 'tapas,' or the fire of purification. But you don't have to physically burn it away, not with muscles and breath. The only fire you have to kindle is that of your own intention to sit with this discomfort until it passes. The sooner you put that light, that flame, that spark to it, you'll be amazed how quickly it burns.
I learned this trick to deal with anxiety and panic attacks--instead of running from them, avoiding the discomfort (which any sane person would do), you sit with it. You give it, tops, 90 seconds of your time, but here's the catch--in that 90 seconds you have to feel it. You have to explore it. You don't have to understand it; in fact, it's better if you don't try. Just feel it; feel all of it, and let it burn itself out with you as witness. It will, despite your disbelief, it will.
Luckily discomfort doesn't play by our rules. It has a shelf life and it's far shorter than you can imagine.