Can't open messaging app

A

AC Question

Yesterday, my Samsung phone was having trouble loading my messaging app. It was quite slow to open. I thought it might be too full, so I deleted a bunch of old messages that I don't need. That seems to have made it worse. It was taking longer and longer to open. Now, it opens but I get a blank screen and eventually, a window pops up asking if I want to report, wait or close messaging. I have tried all three. I have also tried shutting down and removing the battery for a few minutes. Any suggestions would be appreciated!