Welcome and you are in a good place. Nothing happens quickly with sleep apnea, so you are not in imminent danger, but yes your numbers are not on the good side and you need to get treated in a timely manner (not TONIGHT!), but sooner rather than later would be good.
Do you have insurance or will this be out of pocket?
Get a copy of your sleep report and tell us what the numbers are.
You do not have to get the machine from the doctor, but you will need a prescription.
Checkout the supplier list at the top of the page to get an idea of prices.
CPAP is a generic name and also a specific type of machine CONSTANT PAP machine, then there is APAP, BiPAP (VPAP) and ASV PAP machines. these are in order of cost $2600 is between BiPAP and ASV, so check the links above to get educated on costs and what machines cost what.
I don't know what a BOC doctor is.
You will get LOTS more info after the morning crew gets on board, relax and don't panic, nothing will happen soon. Educate yourself, read and ask questions. This is important, but nothing close to a heart attack.
If you are looking for a machine on a budget you can buy used and save $$$... You need to know what machine is what though.