lost my stuff under in 30 seconds

i died to an iron golem in my base he did not stop killing me i died over and over again and i lost all of my items, the items despawned in under 5 minites i am extremely fustrated about this because i got mending on everything and took me 4 or 5 days to get to the level that i was 3 minites ago. the iron golem has to stop killing the player after he killed once as he is extremly powerfull