Hi, sometimes it can just be about getting through one hour (?) at a time. If relaxing is just allowing all those thoughts to flow (it's not a good time) and there's no way you can shut them down a bit, then whatever you can do to distract yourself from them e.g. something that you're going to need to focus on. Just force yourself to do something/anything and force your focus.
You know you could even try some mantras or mindfulness though if you haven't already, let them "consume your mind". And you know if it takes a while, you're tired for your therapy, that really doesn't matter compared with getting through your thoughts/feelings now. That is the most important thing.
Alison