Sayyiduna Anas (radi Allahu anhu) narrates that Sayyiduna Rasoolullah (sallal laahu alaihi wasallam) said, “He who reads a single Durood upon me, Almighty Allah blesses him ten times, ten of his sins are forgiven and he is increased ten times in stages (spiritually)”. (Mishkaat)
if that anon's really going through depression, ask him/her to listen to Surah Rehman before they go to bed and pray 5 times regularly. This really does help. This is probably the only thing that might get them through it.