Is there any legal action i can take to prove my case against a major corporation ?

First off, it is very hard to give you accurate advise without being fully informed of the facts of the situation. Even though you have tried to explain a lot of things here, a lot of things you talk about will need to be examined by an attorney before assessing if it makes sense to sue them or defend yourself (if they have already sued you). I would definitely recommend discussing your options with a competent attorney. Some simple things that you can do to strengthen your position are making sure that you have copies of emails, photographs, statements of people you think might help your situation (maybe a doctor who immediately attended to your condition) and the like. Try to have communications down to writing (even emails are good) rather than oral so that you have a record of whatever happened.

You need the assistance of a product liability/personal injury attorney. Your case is extremely difficult and the amount of evidence that you need to gather is enormous. It may take months if not years to build a case. You also need to prove damages. There are so many excellent attorneys here on you can contact directly for their opinion. Good luck!