"A multitude of errors"

I underwent a routine vaginal hysterectomy last year. I was lying back in the ward after surgery when my sister-in-law came to visit me. She was shocked to discover that I had lay there for almost 4 hours without any observations having been carried out. She immediately asked for observations to be done where they discovered my pulse, blood pressure and heart rate were going haywire. It was discovered that the surgeon had severed an artery. I was rushed back into theatre for repair and received 5 pints of blood as I'd been bleeding internally. I came round again in the ward in the middle of the night to find a lot of staff standing round my bed. Apparently I'd been overdosed on morphine and had to be given some form of anti-dote. I struggled to breathe and had to be given oxygen periodically for the next 2 days. Almost 9 weeks later and I'm still in pain, have no energy and have started suffering panic attacks. I should have been back to work 2 weeks ago but I just can't manage. The consultants reply was to say to me these things happen.