advice for better sleep

Hi, this is my first post in this community. I been diagnosed with ocd by a year now but recently i been had a lot of trouble for sleeping, thing that never happened to me before. Everytime when i try to sleep is like my brain gets louder and i start of thinking and remembering things that make feel anxious (death of someone, missing pets, moments that make me feel guilty) and it makes impossible to sleep, sometimes this can las hours. Usually, calming and relaxing music keeps my head busy and i manage to sleep, but this week, not even the music is working. I thought of maybe just trying to not think at all and just use noise-cancelling headphones but i feel like is even worse. I honestly have no idea why this been happening, since in my daily life im very happy and nothing stressful has happened to me. Does anybody has any advice on how to sleep better? Does this only happens to me or is it common?