No, not all Foretellings are so loud and violent. For evidence, we can look at the other prominent Foreteller in the series: Elaida.
Much of Elaida's actions were based on a Foretelling at the "royal line of Andor" would be the key to winning the Last Battle; that Foretelling drives many of her decisions during the series, including why she attached herself so closely to Morgase and was so insistant that Elayne be found and returned to the Tower. It's very strongly implied that no one else knows of this Foretelling, since it's widely believed she misinterpreted it, but that possibility is never raised in the novels.
In addition, Elaida had a foretelling about Rand when she first sees him in the palace at Caemlyn, and though she does tell Morgase about it, she doesn't scream it at the top of her lungs.
The reason Gitara's Foretelling was so violent was most likely due to just how horrible and shocking the images were, and the severity of the Foretelling itself. This is also likely the reason it killed her as she gave it.