OT: My 22 month old has turned into a whining, crying baby

Macon is having major issues with communication so I bet that is it. But I wonder why it started all of the sudden? He is very smart and understands what we say and can follow simple commands but he cant speak many words yet. He has been recieving speech therapy once a week for an hour for 5 months but it doesnt seem to be helping. I bet he is just frustrated and I need to try to talk to him more when he gets that way and try to figure out what he wants. You guys are great. Keep the advice coming.