"Deep B rain Stimulation"

It was agreed that I was a good candidate for DBS in October and that the intended operation would take place in January 2015. I chased the hospital and was told they could not give me a date but it would be soon. I again called in March and was told it would be 20th March and that we would receive a letter asap. I chase every couple of days but still no letter. I then got a phone call today 13th March saying the operation has been cancelled and that I would receive a letter next week with a new date. I am really upset about the continued delayed as this is causin me extreme stress which makes my condition worse.