Andirubes, it still happens to me.. after 18 months gluten-free. To be fair, I have actually been glutened, I think, but it was on my FIRST day of holiday (and then I got glutened again as soon as I got back to Rome having steak and roast potatoes in a restaurant I've been to before. How do I know? well--- the explosive consequences coming in one hour later are proof enough to me).
However, you have been just one month gluten-free. One month! You need at least six months for your guts not to react to any kind of irritation. Think of this: if you had a skin burn from an acid and you stopped slowly pouring acid over it, you'd get better. But anything apart from soothing creams would NOT be appreciated by your burnt skin while it heals. How long? Well. You are young, you should get better sooner than me! But do not get scared if you get sick apparently with no reason. it is, unfortunately, completely normal. But it DOES get better, believe me. It's a lifetime care and you cannot slip but it does get better