What to do about getting food poisoning over a 2yr. expired drink that was sold to me at a store?

I purchased a starbucks frapp today at the pharmacy while picking up my daughters medicine, I drank almost half of it a notice it had a odd texture. When I looked at the bottles exp.date it was over 2 yrs expired, within 5 minutes I was throwing my guts up, I went to the ER and they said it was food poisoning obviously, they said I’ll be ok in a few days and sent me home with meds, When I called the store manager and told him what happened he checked the cooler and found a second bottle with same exp. date, I am concerned that more of these bottles may have been distributed by the vendor also. Should I sue, and what amount do you sue for pain and sufffering? Starbucks corp. has taken responsibility for this event and offered me a $100 gift card and to pay my hospital bill. What should I do?