Had allergic reaction to a product and no warning label any where on package. None on web site to find out highly toxic and causes exactly what happened.

Prior to filing a lawsuit against the manufacturer and store where you purchased the product, it may be possible to settle the case with their insurance carriers. Notify the insurance carriers in writing of your personal injury claim.
After completing your medical treatment and being released by the doctor, obtain your medical bills, medical reports, and documentation of wage loss. Your claim filed with the insurance carriers for the manufacturer and store should include those items.
Compensation for the medical bills is straight reimbursement.  The medical reports document your injury and are used to determine compensation for pain and suffering which is an amount in addition to the medical bills.  Compensation for wage loss is straight reimbursement.
If the case is settled with the insurance carriers for both the manufacturer and store, NO lawsuit is filed.
If you are dissatisfied with the settlement offers , reject them and file a lawsuit for negligence and strict liability against the manufacturer and store. Negligence and strict liability are separate causes of action (claims) in your lawsuit.
Negligence on the part of the manufacturer is the failure to exercise due care (to include warnings on a product that is inherently dangerous) to prevent foreseeable harm. Strict liability imposes liability whether or not due care was exercised.
The store is liable even if it could not have known the product was inherently dangerous.
If the case is settled with one, but not both parties, (manufacturer and store), only name the party with whom the case has not settled as a defendant in your lawsuit.
If the case is not settled, your lawsuit must be filed prior to the expiration of the applicable statute of limitations or you will lose your rights in the matter forever.