Anyone else had experience with medicinal cannabis in the UK

I take medicinal cannabis and did some group therapy at the Maudsley after a long wait. However they said I was not eligible for the one to one therapy afterwards because I take the cannabis. They will only treat me once I come of the benzos and cannabis I take. Which is a bit like saying get well and then we will see you. I have CPTSD and the cannabis really has helped. It makes me laugh they refuse to treat me until I get off of it