Pouring your heart out on social media practically invites abuse from trolls. There's so much repressed impotent rage now in this society that for some people opportunities to judge and demean others online are irresistible. Bullying gives them a sense of power and they think expressing lack of sympathy is a show of strength. See them for the sad failed people that they are.

Make real friends and talk to them offline. If you must use Facebook, make your postings visible only to friends.