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Have you been back to the dentist to have any adjustments done on these dentures?Are the pains in your head on the sides near your ears?
Are you still there?
The sore throat may be due to sleeping with your mouth open, which may be the result of improper "Occlusion" - the way your denture teeth come together in contact when you close together. The headaches mayalso be related to your "occlusion". I would ask the dentist to evaluate your "occlusion", or "bite" after explaining your symptoms to him. This could be a relatively simple way to correct your issue. It is much less likely that the implants, themselves, are the basis of the problem.
Hope this helps,