LPH, the kayak'll probably be okay - some warm sun on it will help as well.

Any time my kayaks have gotten bows or mishapen, they've lost the shape fairly quickly. One of them is a prijon. (strapped to a roof rack in 95 degree heat tends to make 'em a bit wonky shape.

Pour in some water, and definitely turn the kayak over so that your bulge can fall out of it. The weight of the water & the heat should help.

Just don't expect things to fix themselves immediately - it probably took a while for that bulge to get created, and it may take a while for it to work itself out.

You could contact prijon and see if they have any suggestions.