I am so very sorry about the scary news from the neurosurgeon. I pray that Hunter has a successful surgery and that he makes a complete and speedy recovery!!
On a side note, if you are able to give yourself a minute, I would tell MIL to go fuuck herself.
Jen, I'm so sorry to hear this, but I am praying for a very speedy recovery for him! It can and will be corrected and in the end he will be fine. That's the important thing. In the meantime, please let us know if there is anything at all we can do to help! Lean on us if you need to vent or cry or anything.