The popular Instagram star, 23, was pictured being stretched into an ambulance at the bash – attended by the entire Kardashian clan including Kim, Kylie, Kendall, Khloe and Kourtney.
Taking to her YouTube channel, the Queenslander – who has, in the past, been named as Khloe Kardashian’s fitness inspiration - told her legion of supporters what had happened to her.
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"Firstly I want everyone to know that I'm ok...So yeah I pretty much collapsed. Honestly I'm already like super super embarrassed about it," Tammy said – appearing emotional on the clip.
"I probably, definitely shouldn't have been drinking because of how jet-lagged and exhausted I was and I already wasn't feeling well."
Tammy then went on to give some background details of what caused her collapse.
"So basically what happened was I was in LA I was running off pretty much 30 hours of no sleep," the fitness model revealed.
"I was struggling to stay awake even when I had my hair and makeup done...I could barely keep my eyes open."
The star – who split from boyfriend Reece Hawkins earlier this year – then touched on the break-up.
"I've been throwing myself into work way more than ever and I have my kids majority of the time...literally been non-stop on the job kind of thing," Tammy said.
"I think because of the break-up, I've been trying to keep myself busy and not really taking time to think about how I'm actually feeling."
Back in June, Tammy opened up about her split from Reece Hawkins – explaining the pair had gone through "ups and downs like everybody".
"One or two months ago, I decided to end things with Reece. He didn't cheat on me, I didn't cheat on him. It wasn't like that at all," she said in another YouTube video.
The couple have two children together – Saskia, one, and Wolf, two.
"I don't want people to think we just gave up. Most people know relationships are very complex."