Hi Melissa, difficulty with immediate dentures is fairly common. You can ask your dentist if you can use a denture adhesive paste or denture adhesive powder to help with the rocking and stabilize the denture while eating. The sore spots you are experiencing are common as well, and can be helped by the dentist making adjustments to the denture. People also suggest rinsing with warm salt water to help with the pain of the sore spots. There’s lots of people on this forum who have suggestions for foods to try and pain remedies, so definitely check out some of those threads. I hope this helps!