Addiction, Examination and Communion

I’m struggling with a gambling addiction and have tried to stop. What can I do? Why did Jesus ask the Father to forgive the people who crucified Him? A pastor of 36 years recently announced he has embraced an alternative lifestyle. I’m trying to wrap my mind around it! Who is being described in Revelation 22 as a person who subtracts or adds to prophecy? If we’re totally forgiven people, why do some believers examine themselves each time before taking communion?