Had food particles in wisdom tooth extraction site for days and was in pain. Finally got it out by rinsing from side to side. Will it cause an problems?

Rinse. It is normal to get food particles in an extraction site. Normally the Surgoen gives a list of post -op instructions. One of those is to start rinsing with warm salt water 24 hours after your extraction. You should do this after every meal or snack to insure no food particles in the socket. If your pain is subsiding than you are on your way to recovery. If pain is increasing than see your dentist.