(EXPERIENCE)
to experience a difficult or unpleasant situation: I've been going through a bad patch recently. You'd think his children would be more sympathetic toward him after all he's gone through (= the many bad things he has experienced). More examples. She's gone through a lot in order to achieve what she has.
What does have gone through mean?
1 to come to a knowledge of (something) by living through it. I know how that feels because I've gone through it.
Has went through or has gone through?
Went is the past tense of go. Gone is the past participle of go. If you aren't sure whether to use gone or went, remember that gone always needs an auxiliary verb before it (has, have, had, is, am, are, was, were, be), but went doesn't.