Yes you can still feel pain and some slight symptoms even after all seven days, the antibiotic continues to work for a day or so after antibiotics are finished. However if it continues for more than 48 hours after finishing the medicine you should go back to doctor....or if it gets worse.
The other thing is you may have a strain that is resistant to amoxicillin and may need to get a different antibiotic altogether.
Are you getting better at all?
Gargle with warm salt water. That can help remove some of the bacteria and white patches. Also warm tea with lemon helps....