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

This is sooo funny --- my son who is now 2 yrs (as of Dec 18th) was horrible from about 19 months and still sometimes has days when he is impossible. I even stopped taking him shopping with me cause it was a non stop crying fit. Even if were outside playing he would cry & scream. I was beside myself cause my DD never did this. THey DR never found anything wrong and claims they get frustrated easy and can't comunicate. His crying fits would last 1-2 hrs. THe longest one was almost 4 hrs long. I would either let him go or I would sit and rock him. I never found a way of stopping his crying but I would try to comfort him. Now at 2 yrs he is growing out of it , although, he still has days. I have to make sure he gets his nap or that will set him into a terror. My suggestion -- buy a good set of ear plugs!! LOLI doesn't last forever and someday we will look back and laugh about it. HOPEFULLY!!!!