Pain

I am in physical pain, everyday.  It is no longer a question of do I hurt, but how badly.  How much pain is acceptable?  How can I do this much more? What if this is my life and it never changes.  I don't feel strong enough to do it.  What kind of life will my family have? I don't really understand this.  I know that God is good.  I know that He cares for me in a personal way.  But I don't understand how this fits... What should I be learning?  Will I get through this?  I feel like I am drowning