You did awesome! I know how hard it must have been to let him climb again but that moment was pretty crucial in your child's growth - no fear and keep at it!
There will be many a times where we dad's won't be there to catch our kids, that's what we should be preparing them for.
Dude, first of all, I might not be able to fully comprehend the situation you are in but no matter how big the loan, in the end it's only money. Life is more than just that - look at what you have accomplished against all odds! Seek out professional financial advise and I m more than sure that you will come out stronger! Cheer up man!