[@Letter Bee]about your powers:
1) Exactly what stress caused him to get these powers?
2) Repair and healing could be the same power if you can think of a way that he could "need" the power and one expanded to become the other.  They shouldn't be instant repairs, though.  Maybe a time based on damage, and it gets more powerful as you go?
3) Transmutation is OP, but because powers start small and grow stronger I might allow it if you place limits on it that make it weak in the beginning.  Ex: It becomes something similar, like a block of wood becoming a wooden object.  You could also go the "Full metal alchemist" wrought and make all of them different forms of transmutation.