FTM. help!!

Ti
Hi mommies! I have a sweet little 3 week old boy named Jett and he has been a dream since birth! He was sweet and sleepy during the day and only woke up twice during the night for the first several weeks. He has just now started to get realllly fussy during both the day AND night. He's only happy when I'm holding him in the daytime and screams the second I try to put him in his cosleeper or swing. He wakes up 
 onstantly at night and I've already tried gas drops/excersizes, extra burping, and I've cut dairy out of my diet. I'm starting to feel really discouraged. Have I already spoiled him or is this a normal phase? HELP!!!