I understand that when a warforged enters a wildshape he can no longer be repaired, he loses the healing penalty, etc, but if I take the healer's friend enhancement does the healing bonus apply when I am in an animal form? (do I heal for 115% with one level of healer's friend while in animal form?)

Do I lose my damage reduction when I enter an animal form?
Do the animal damage reductions stack?

How does power attack work when in an animal form?
If I have a quarterstaff equipped when I enter a bear form do I take -5 to attack but get +10 to damage, or do I only get +5 to damage?

Any answers would be greatly appreciated.
Thank you!