Emotional Support Dog

Recently I was told by my therapist that I had to get a trained emotional support dog to help with my mental health and around my college days. Since they are hard to come by from the UK I had to find a trained dog site which is quite expensive for me to cover. The deposit for the dog is £500 the rest being nearly £4,000 which covers the training and vet bills with the new animal. It would be great if I could get some help with obtaining the dog I need to keep safe and stationary.