@Ahmadhd1
I am not an expert, I can only speak from the cases I have seen on this forum.
1. Try not to worry about your donor area...I have seen many cases on this forum similar to yours. Of these cases, the vast majority of the patients experienced a full regrowth of the hair. I would expect the same for you.
2. Minoxidil has demonstrated ability in helping shock-loss and the recovery of natural hair. I would speak to your surgeon about using this and if ok, get using it as soon as possible.