If you have not signed anything, you may be able to take it back. You should contact an attorney to review your issue immediately.

What do I do, my mother got electrocuted at work, at a major airlines, what should she do?

Assuming she has been treated for her injuries, she should contact an attorney immediately. Depending on the property location where the accident...

More than likely, yes. You will need to collect all your medical bills, records, and proof that there was a screw in your food.

Is the procedure for medical examination the surgery?

Yes, generally a biopsy is considered a surgery. The doctor who performed the biopsy can confirm if you still have questions.