“It was that debilitating stage where I couldn’t function,” she told BBC Radio Ulster’s Good Morning Ulster.
The only thing she could do was “hide it from [her] children”, she said, adding that she would take them to school and get back into bed until it was time to pick them up.
She got to the stage where she “didn’t want to do anything”.
“I checked out completely of social media, of any career in comedy, I wasn’t being social or seeing friends,” she said.
“I was literally just getting by day by day.”
On Tuesday, Ms Terry shared a video on social media explaining what had been happening.
She said she had planned to start posting more consistently ahead of her upcoming 2026 tour – but she wanted to be honest first.
“I hope nobody was looking at my social media going ‘oh my god I wish I could be where she is’ because they had no idea I was at the depths of depression and that’s what’s so dangerous about social media.”