What can be read for very bad headaches

my husbands sister borrowed some money a few years ago, dropping her sad tears that we feel sorry for her & her husband, so we actually did help out in a big way & were promised to be paid back. When my husband did ask for the money after quiet a while the family got funny & then they all pushed him away, this sister feels just because she is the only sister the brothers must help her, eventually we never got paid & i left it in allah’s hands, but this still upsets me even though the family speaks to each other now everyone is so materialistic & you can actually feel their falseness & that this sister or her husband still feel no shame of what they have done. In order for me to get over this can i write that money out as saddaqah & must i tell them abt it….. if not pls tell me how to block my mind from this i feel like we were betrayed & used.
Shukraan for all your help.
Salaams.