30 year old upper dental bridge causing excruciating intermittent severe pain for 8 years! What can I do?

(l am 70) .Can 30 year old 2 large upper dental bridges(12 pieces) cause excruciating burning pain on upper palate? I saw 2 dentist but they didn't assure me that the burning unbearable severe pain may subside(?)after the replacement of the 12 pieces bridges. The cost is 20k to 30k and no guarantee. What do you advise. l cannot stand the severity of the burning pain any more!!!!! I need help!!!!!!!!!!!!!!!!!!!!!