What advice would you give others for helping to prevent soreness?

I don't have any reply to give my I have had mouth soreness since getting my dentures. I had six teeth extracted and the denture placed the same day. I've been to the dentist for revising the denture but the pain persists on the right side of my mouth. The gums are still not yet healed and the pain in the morning especially is agonizing. At first there were little shards of tooth/bone poking out but most of those are gone. The gums, though, along the edges, feel as if those shards are just underneath although my dentist assures me they are not. There is a white area that rubs on the denture that almost feels like a canker sore. I'm miserable. I've tried going without my denture for a few days to let my gums heal more but it doesn't make any difference. What can I do?