During a nursing strike, you do not need to feed more often. Do your best to get him to eat at normal times. He will eat more when he is feeling better.
If he is not producing at least 5 wet diapers per day, you need to call your doctor and take him in. He could be getting a virus or an ear infection.
You can also try a little Motrin or Tylenol, dosage as suggested by your doctor, 10 min or so before a feeding, he may eat a little better if it is teething.