It does take time. I was one of the 3 days into the diet people, but that was followed by lots of downs, too. I would say the bulk of my healing was done by 6 months, a few more issues cropped up around 9 months or so, and it was a year+ before I really felt consistently good.
It's a learning curve. Keep reading. Be sure you're on top of your vitamin and mineral levels. The first few months are the hardest, because that's when you're figuring out your body's specific reactions & sorting through fact and fiction for celiac & trying to figure out what you can eat. My advice is to get a handful of foods you know are safe and build from there.
If you ever feel like you can't eat anything--like you're reacting after every meal--then you've likely been glutened in the days previous. This one took me months to realize, but I react after every meal, regardless of content, after I've been glutened (for several days.)
You might start reacting more strongly to gluten at first. Don't let this discourage you. It's your body getting stronger & your immune system more capable. I noticed that after a year, my reactions markedly decreased & now they're much lower than they were before I was gluten free, but that adjustment period can be hard. Good luck!