I placed an expedite request for EAD last week and it got approved today.
Timeline
Filed 12/13/2018
1st NOA 12/17/2019
Biometrics 01/11/2019
Case transferred base on A11 03/04/2019
AOS "ready to scheduled for Interview" 04/24/2019
Expedite inquiry 06/11/2019
Request for additional information 06/13/2019
EAD approved 06/18/2019
Don't expect any updates on AOS until January general waiting time in Las Vegas is 13.5 - 19 months but at least I can go back to work
Sorry to hear/read that.
https://www.uscis.gov/forms/how-make-expedite-request
You have to call and USCIS will get the request going for you, it will take up to 5 days until they ask for either more proof or they approve you right away or deny it right away. The agent is just entering your data into their system and placing this request for you at what ever location your paperwork is sitting at.
I filed same day as you did and placed an expedite request last week and it is under review right now.
Medical conditions have the highest chance of approval but still fairly low of actually getting approved. -> Don't quote me on this, that's information I got from VJ and the different forums.
There is also this...
https://www.uscis.gov/green-card/green-card-processes-and-procedures/travel-documents/emergency-travel
Hope it's going to direct you in the right direction