Sorry to hear you're going through this.
We are currently going through testing and pead reviews to try and help us.
My dd sounds very similar. I have been offering reassurance when needed and also being aware of my reactions etc when dealing with her. Not sure if its the right thing but it appears to be helping.
Dd can verbalise when she doesn't feel good which is helpful to us but like you she also Goes to school next year so we are trying to get in top of it now