My daughter is 3 but I swear she acts 16. She used to be this sweet little darling. Now all she does…

My daughter is 3 but I swear she acts 16. She used to be this sweet little darling. Now all she does is yell and scream and try to hit and throw fits. I'm honestly thinking she has some type of sensory problems. We have a Dr apt soon. So hopefully I will find out if this is something I need professional help with or if she is just spoiled. This mommying thing can be so hard some times.