"Lost me on their system"

Well where do I start. I was admitted in twice in one week by ambulance with terrible pain which turned out to be stones in my gallbladder. Was told at the time my scan was very clear and detailed and showed I didn't have, only to be told after mri I did have, bare in mind I had been sent home between scan and mri, my mri was done on the Tuesday after a muck up of communication, fasted for 7 hours through the day, was told someone would be to see me that night or next day with results, no-one came I layer til the Thursday night, bare in mind I hadn't seen a consultant since the Monday morning, no-one came near me I kept asking the nurse why no doctor has come to see me for 3 days, turns out they lost me on their system, they had no recollection of me even being there. I have been in pain constantly now week 18 on waiting list, my weight has plummeted so much, when will I ever get my operation, just want my life back.