Can my crown on my lower molar be causing my upper molar to fracture and a lot of pain and headaches?

Went to the dentist and he is insisting that the crown on my bottom molar is risen and that he can try to push it down and readjust it but that because there is not enough porcelain it won't look or feel good afterwards. He says the metal will rise above the porcelain. He is looking to replace the entire crown and he says that's the reason the upper moler is causing me so much pain because the crown keeps hitting into it. Can this be true the bill is quite expensive!