Fortunately you are collecting workmens' compensation. You cannot collect damages for pain and suffering from your employer.
I do not know how severe your injury will be or how long you will be out of work, but, regardless, you should call a lawyer to see if you have a viable claim against the fitler manufacturer or anyone else. Most good personal injury lawyers will give you a free consultation.
There may be some way that the person's homewoners policy will cover this, but probably not. If the person has assets, then you might be able to execute on the assets, but most likely there will be no assets you can find. My suggestion is to contact a lawyer to discuss this.
I agree with the attorney who advised you to go to the emergency room. Your health should be you number one concern. After you are diagnosed you will still have plenty of time to determine whether you should see a lawyer.
Normally signing a release ends your case. I would be interested in exploring your case further. If the right kinds of mirepresentations were made, I would be interested in trying to have the release voided. It is difficult and we might lose, but with the injuries your wife sustained, it is worth exploring provided you are located in the southeasern Pennsylvania area..