Hi B
Welcome to the forum, you might want to have a look at the following FAQ which explains where everything is
Welcome to Benefits and Work In case you are not aware, your real name appears to be showing in the forum, if you want to change this then follow the instructions in the following FAQ
My full name is showing, how can I stop it?
Claimants can be subject to ESA reviews, 1,2 or 3 years. Some people's reviews have been longer but that is usually down to delays in the system.
I am sorry that your son is so distressed by this. The DWP often says that there could be improvements in a claimant's mental health so that is why the reviews come up more often. The only chance of your son getting a longer review time is if your GP or a mental health professional is able to provide an up to date letter of his condition and difficulties supporting him. And if possible say he is not well enough to submit to a face to face.
BIS