I'm so glad you have your diagnosis. I hope this doesn't sound at all cruel, but whenever someone in my life tells me they are diagnosed with celiac, I actually feel a little happy for them because I know (if they stick to the diet) that they are going to feel so much better very soon.
I second the Udi's chocolate muffins. They are so good. They actually still make me a little sick, but sometimes I just have to do it, like a birthday.
I do not have a celiac diagnosis, because after a negative blood test (hadn't been eating gluten for months) I just could not face going back on gluten for the endoscopy. But whatever you decide to do is fine. If I had the blood test I'd probably call it a day, but some people like to know the extent of villi damage.
I hope you start to feel much better very soon!