Do I see a neurodentist or dental imaging? (Photos)

I had a second full upper bridge installed. The dentist had to wing it since my original impressions are gone. Now I have headaches every day, all day for 4 months. I've been back to the dentist and he keeps tweaking but we cannot seem to locate the discrepancy in the bite. Is there another type do for that would be able to clearly see what may be wrong? A dental imaging or something? Need your advice please