Sometimes when life is painful believing it is a lesson you have chosen in this life just makes you feel worse. I learned that myself.
Sometimes when life is painful all the spiritual mantras ring hollow and make you want to vomit.
Sometimes when life is painful all you can do is feel the pain and wait for it to pass knowing it will and 'shit happens' and loving people means you will hurt sometime or another and there is really nothing you can do about it.
Sometimes when life is painful, after you have felt the feelings - never drink on a full heart - the only comfort is God's gift of a stiff gin or large glass of wine at the end of the day. Or maybe two stiff gins or three glasses of wine!