from a "faith" standpoint, we are put here by God in His Image to give to others and to show other's his goodness. (remember, however, that this is based on faith, so if you dont have faith, none if this makes sense). Unfortunately, one does not always fulfill our "purpose" before we leave this earth.
I have Parkinson's. I was always athletic. i coached, and played baseball for many years. i've always have questioned god as to why i have been afflicted with this. well, the answer was simple. i have been chosen to 'carry the cross" for god. When i coach, i can show others how jesus lived his daily life with his "cross", and show how we can be successful even though we may have crosses as well.
With respect to pain and suffering, we were given the gift of FREE WILL, which separates us from other living beings. but just as free will can compel us to help a person in need, it can also compel us to have an abortion. SO, as if we can get lung cancer from smoking, god didnt light the cigarette, we did.
we must realize that our time here on earth is compared to a single second in our "non-earthly" lives. thru faith, we have confidence that pain will be short-lived, and soon be with god.
we can only believe this, of course with faith.
be well
tom