I am very sorry that your surgery failed. Have your doctors given you any reason for lack of O2? I think if I were in your shoes, I would get a copy of all my medical records and start reading them with a fine tooth comb.
I also want to welcome you to Neuro Talk. Many of us come here in a very frightened state, and or facing some serious medical issues. You will never be alone here. After a bit of time, many of the folks here become like a family. This site can help you get through the medical problem, and maybe give you some Ideas on how to help you.
Have you gotten a second opinion for the effects you are feeling?
I am alone too bellakinns, but I don't feel so alone when I am here. I lost a few friends because of my own health conditions. There are people who have never experienced a trauma before, and therefor don't know how to respond to a trauma in another person.
In your case lack of O2 is not something I have heard of before, and the reason why I would seek out the medical records. I hope that in time you get to feeling better, or find a physician better able to address your needs. ginnie