Sorry hear about your story. Perhaps casa could review or re-examine their decision. Personally I have had no issues with casa so far because if they point out some deficiencies in the operation then we agree with them and fix it exactly the way they want. The trick might be to have a good relationship with your local casa officer and frequently communicate with them and invite them to visit your operation, but never allow an unknown foi anywhere near.
We actually found casa to be lacking the manpower and resources to do a better job. They also struggle to find suitable staff.
Do do you know why your engine failed? How is your paperwork like ( flights and maintenance). If your paperwork is no good then they take such an action.
All this stress must have induced your illness. Sorry to hear your story