Growth plate separations are confirmed via x-rays and graded on the Salter-Harris scale. Certain types of separations are further confirmed by taking x-rays of both elbows and measuring the thickness of the growth plates. That is pretty cut and dry.
Recovery from a growth plate separation usually involves rest. I assume you rested for 8 weeks or so before starting PT. Even that might not be enough - it’s been my experience that growth plate injuries can linger so you need to ease your way back into your activities.
Have you had your mechanics evaluated? You could have a mechanical issue that is causing or contributing to the pain.
Now, having said all of that, pain that is a 7 out of 10 says you really need to go back to the doctor and get checked out again.