I know just how you feel. Somewhere down the road I will be posting a picture of a quilt with a pattern like this and far worse mistakes. I had shown the top to at least six "seasoned" quilters and no one said a thing (and they're not the kind to hold back). I didn't discover the problems until I was about 2/3 of the way through quilting it. I think you're lucky you've got the minimal mistakes you have and like the prior posts say, you should be able to fix it. Good luck!