That’s easy to answer: Grab some explosives or grenades, yell at the Zombies (SHIFT+C key), [a]ctivate the explosive and run towards them. In the end, you’ll have 79 killed Zombies and at least one body that will certainly not rise again.
Alternatively - if you don’t have any explosives or in case that’s not your style - you can just stand still and wait (. or 5), or you can press SHIFT+Q to speed it up.
In all seriousness; There’s a very slim chance that you’ll make it out alive.
Unless you find an NPC that can and will protect you, or you can run away and hide until the bone’s mended, the only damage you’re going to deal is by kicking those Zombies (as in; just walk into them) or lure them through damaging terrain (aside from dropping live explosives and either run fast or die with them).
You’ve mangled both your arms in a Zombie appocalypse. If you let stuff like that happen, it’s expected to end bad…