There is a private clinic that is quite impressive in Zihuatanejo. There are also several English speaking doctors that are very competent. The name of the clinic escapes me at the moment, it's early morning. However, I went with a friend, as her translator last year when she had a pin removed from her broken leg that was surgically repaired in Tepic. They were exceptional, and relatively inexpensive.
I suggest you follow and ask your questions at zihuatanejo.net. Rob runs a great board. See you on the beach in November!