I know how that must have broke your heart, but you have had many suggestions from your friends here, so I bet you work it out. I'd probably get a piece of iron on interfacing and place it on the back, bring edges together as well as you can, then backstitch . For the top, use some Wonder Under on some fabric scraps, fuse down then hand stitch down. A whip stitch is just going from the patch to the background, moving forward each time a little bit.