"Waiting list changed my position "

I've come at 12:30 on 190722 40 degrees told not to eat drink , at 3 pm. Nearly fainted went to reception desk asked what position I'm in , they couldn't say , the nurse head came and he said to me oh sorry you are now 4 th on the list it changed , I said till what time he said 6 pm, so I said time I have operation , then recover from aneathtestic then eat , how long before I leave to go home , it's ridiculous I'm so upset and I suffer anxiety and OCD, who changed me on the list !