Mrs Brown's Boys actor Rory Cowan has asked his solicitor to try and identify trolls who abused him on social media and compared him to paedophile Jimmy Savile.
The much-loved Dubliner said he received a number of abusive tweets from several accounts after he attended the Crumlin Ward Walk at the Crumlin Children's Hospital before Christmas.
"It was the strangest thing at how quick and viciously it happened," he told RTE Radio One's Today with Sean O'Rourke programme.
"I replied to a tweet and before I knew it, I was being accused of being a molester.
"People were saying 'here Rory, leave the kids alone', 'Rory will fix it' and 'I'd take my kid out of hospital if it was being met with celebrities like you'."
Cowan, who plays Rory Brown in the hit RTE show, described his shock at the torrent of abuse.
He said he normally reacts to critical tweets like "water off a duck's back", but was surprised at how offensive the messages were.
Cowan said his solicitor is dealing with the matter and they are on a mission to find the people behind the accounts before reporting the issue to gardai.
"This is something that's completely new to me, I don't know what's going to happen," he said.
"There's no point in involving the guards if we can't find out who these people are. I don't want to go and say, 'I'm a victim', you don't know where this is coming from, it could be from the UK or abroad.
"I should have ignored them. In the end, I thought I had to get on to my solicitor about this, it was taking on a life of its own. I was actually sick to my stomach.
"I couldn't believe what was coming in and so quick. It was like a kick in the stomach."
He said Twitter should be a "fun" thing, but now he thinks he will hold back a bit on the social network.
"I'll think very carefully about responding, or even what I'm writing myself," Rory said.
"It should be no problem but unfortunately, there are people out there who've accused me of the vilest things.
"I will stay on it, I like it. When you've nothing to do you go on Twitter," he said.
"If you're waiting on your TV programmes or the tea to happen.
"But I won't be engaging as much with people anymore."