I slipped & fell badly in a store, but chose not to get AMV. Now its been almost a month..To late to ask for medical from store?

I didn't want to sue anyone, and just wanted a doctor check to make sure that everything is OK. I do not have insurance, and was waiting for a answer from the store. We did write rapport on the accident, and had a witness that wrote one too. I also have pictures of the damage. I got told to call a number if i needed medical help, and i did, but got told that the waiting period for investigation can be up to 30 days. Now it has been almost 30 days, and the third part that is doing the investigation, has not received anything from the store (Video), so I am still not getting anywhere. I still hurt, but have not been to the doctor for it. I have heard from others that my chances for help now is like zero since i waited for so long and since i didn't take the AMV...