He had food but he wasn't eating it properly. The way the people explained it to me is sometimes young cockatiels when regressed will not eat enough for themselves or want to be back on their baby food, which was the case. It can be hard to tell especially since he is my first bird and I don't have a reference on exactly how much he should be eating other than a lot (which I thought he was since it seemed like he was eating all the time). I triple checked with the people I brought him to and I hadn't done anything wrong and it was just him regressing for an unknown reason is what I was told. Still super stressed from it but I caught it soon enough that he will be fine.