You would never guess he was fussy!
What we found out was that Matthew's reflux is acting up again (I knew this), but that it was playing a large role in how he was feeling and acting. Because of how he was reacting to more acidic foods, it was making his reflux worse and his intestines are inflamed. Basically, his stomach feels full, sick, and bloated all the time and he's dealing with reflux on top of all of that! She explained that he's learned to cope with the reflux so it doesn't seem like it bothers him as much, but it's really uncomfortable for him still which makes him super fussy.
We were told to change his diet and only give him low acid foods and that we should see an improvement in the next 10-15 days. If we see a great improvement, then we can experiment with adding in some of the more acidic foods in small quantities, one at a time, for a few days each to see how he reacts. She also said that between 12-15 months old, he should be feeling much better on his own!
I'm so glad there's a light at the end of the tunnel and we're really praying that changing his diet will drastically help him. It was so nice to see how happy he was for 2 weeks, then the reflux started acting up again. He's been having such a hard time sleeping because of it and eating has been difficult too. There's been a lot of crying going on over here that will hopefully be over with soon!