I would imagine that after 8? years of not having teeth, anything would feel weird and painful for a while. I can’t imagine how that would be. I had only two lower molars out for eight months and when the implant crowns were put in at the same time, it felt so wrong and huge in my mouth. They hurt for a while, too…pinching the gums and caused a feeling of pressure. It took a year for me to finally feel like they belong. Even after they stopped hurting, it felt odd. I just had my lower first molar implant crown put in on the other side and it felt huge as well but when I look in the mirror, it looks normal.
I do know that when my upper front implant was placed, it stretched the gums to the point where they were white and very tight and uncomfortable. It was quite painful for about 24 hours until they loosened up. I imagine with yours having all the gums stretched it would be very painful.
Did they say they could make them smaller? With my front implant crown, I was not happy at all with the first one, but the dentist seemed fine with it. It was only after I brought up that it was the wrong shape and color that he agreed with me and we got it changed out. You might have to be more forceful. I struggle with that and it was hard for me.