Have I lost a bite completely?

Hello , I need some advice urgently please. 3 years ago I have fitted 6 porcelain crowns in my top jaw. After time I started feel that they are slowly shifting.I meant to wear night guard every time when I go to sleep but I did not. I feel like i can not bite at all and front crowned teeth moved forward a little bit. It is very very uncomfortable situation and even my speech is totally changed. I can not even sleep because of this state in my mouth. And I feel very sleepy everyday , lost energy

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