welcome to the forum.
I have had times when I dozed during the day as well before CPAP therapy. World of difference after.
Now that you have been diagnosed, use the time before next appointment to study up a little on types of machines, types of masks, and how to talk to the Doctor, Insurance, and DME to get what you need.
Knowledge is power in this initial transition to ensure you get a machine that will provide the data you need to manage your therapy.
With a data capable machine you will have the info you need to get the most from your CPAP therapy. There are some really sharp people here who love interpreting the data and providing helpful feedback so you can make informed decisions on tweaks you will make in between doc appointments to keep improving.
Armed with a data capable machine, the next challenge for most people seems to be finding the optimum mask fit to nail pesky air leaks so you can get consistently restful sleep. It might take a few different ones before you settle on the right one.
You will get benefits of better sleep along the way, hopefully from day one if you are one of the lucky ones (I was). But you can anticipate a period of experimenting with step-wise refinements until you find the sweet spot where the right mask, the right fit, the right sleeping position, the right number of hours sleep, the right machine settings all come together.
So that's a preview of the way ahead. It's a lot of new stuff to digest but know that you have found a great place to get help.
Here are a few links to get you started.
Hope your followup appointment is already scheduled and that you are days not weeks from getting some real help.
You are going to feel a LOT better and before long one day you will be amazed to look back and realize how impaired you were. It's probably more than you know, but it sounds like your coworkers and your boss have given you some hints already.
Most of us have been there and I'm here to tell you to be encouraged that you are about to turn a corner and it gets better.
Ask lots of questions and take charge of your therapy. This is a generous community of helpful people who know the head fog you are fighting through every day.