You and I are in the same boat, brother. I have the PDF with the files for the doctors to fill out. However, like every legal thing I've come across, they are vague. It refers to gender reassignment surgery yet doesn't spell out which ones are needed. I did notice there are three forms- one for you to fill out and two for doctors. I've looked online and have found no concrete answer so I'm just going to phone them.
Here's their info if you'd like to contact them too.
Illinois Dept. of Public Health
Division of Vital Records
M,W,F 8:30am—4:00pm
217-782-6553
Depending on if I get a clear answer from them or not I might just submit the paperwork after my top surgery. I need my name changed on my BC anyway.