My understanding was that SWATting means someone calls the police and says that you have a bomb in your house or something to that effect. I imagine that the SWAT team breaks down your door and arrest you and everyone else in the household.
Soon enough, they must realize that you are all good, right? SWATting is common enough that they must be aware of it and take it into account. If they started arresting and prosecuting people who were victims of SWATting, there would be big court cases against the police.
To clarify, I am not trying to underplay what you went through. I just want to understand what you went through that made you describe it as "hell".