Back biting and the rules on this:

when you back bite you are eating the flesh of that person, and the sinn goes onto becoming your own......

So it works like this, they perpetrate against you, then you talk about it, then it becomes your own perpetration's'.

There is another relief though, if you have fallen sick in mental tortures', and need to go into recovery, and talking is a aid and benefactor then its allowed. Withholding vital information of health concerns and or other problematics of daily living, that will aid and or benefit your situation, will then go on to be destructive, however, if that illness and withholding information and or vital talking of counselling will worsen your situation or is a gambling position then its also allowed to with stain from talk of bad actions and or other issues'.

This is a general ruling, though we pray all the time, and fasting is also a alleviation.