Well after a ton of evals and observations, Phin has been diagnosed with PDD-NOS which is on the autism spectrum. He is now receiving close to 20 hours a week of therapy. Fortunately it is all in home but still is draining on us all. He is picking up sign language really quickly, leading us all to believe that he is very much a visual learner.
The other day he called me Mom for the first time with sign language...I cried. His frustration level is going down so much now that he has a means of communication. I wish we had stuck with signing while he was a baby, we could have bypassed a lot of tantrums!