Is pain in hips and butt normal two years after BBL?

Two years later and I ve been experience pain in my hips and certain parts of my Butt. At first is was on one side and I also noticed that a huge dip on my hip/side butt had appeared last year by the time of my 1 year post op appointment. I've expressed that concern to the surgeon who at that time, advised me to get hip dip filler to correct the dip. I never got he filler because Im nervous about it migrating. However fast forward to now and the other side of my hop is also aching. I don't know what is going on. My surgeon also has stated he doesn't know. if anyone has any information about the please advise what is causing it to hurt after two years. I feel it more when I sit or lay on my butt/ sides.