I was injured at a Starbucks when the wind blew a cast iron table into me. They have offered medical, lost wages and $5000 additional.

It sounds like you are being offered a fair value for your claim - without any significant injury or permanent impairment you would probably not receive any more from a jury.  If you choose to hire a lawyer, you will have significant litigation costs plus attorney fees, which would greatly decrease your ultimate net gain.  If your treating physician feels that you are fully recovered then accept Starbucks' offer.