Sorry to hear about your little accident which is now causing you a lot of physical grief.
Now is the time to think about the wise saying:
It is not about how you fall over, but how you get up.
You now realise more than ever how fit, strong and tough you have to be physically and mentally to be able to do a long haul bike ride in South America. You are capable of doing your proposed expedition, but need to do some serious training beforehand to avoid potentially serious problems on the road. Good luck !