Hi Sue...I don't know if you want to go this route, but my husband couldn't get a PhD in the traditional manner because he had to teach full time and it was impossible. He checked out all the on-line universities and was shocked at how many excellent schools offer doctoral programs..including Harvard. He enrolled in Walden University which is highly accredited. You do have to go to a couple of intensive class room sessions once or twice a year, that are scattered around the country. His mentor was from Syracuse University. I was just thinking of a way you could do this at your own pace and not have to worry about those painful, foggy days!
Good luck, and I commend you for taking on this challenge! I take it statistics is your passion??? That's my hubby's 'thing'.
Not only get a good nights sleep, but try not to stress over this. You are preparing yourself so now have some confidence in your abilities. You wouldn't have made it this far if you weren't smart and capable! That will show up in your body language. I'm sure you'll do just fine.