Pop superstar Rihanna struggled to finish work on her latest album while she was battling a nasty bout of influenza, admitting she cried under the pressure and "almost wanted to punch somebody".
The Umbrella hitmaker fell sick last October (11) and was hooked up to an intravenous drip in a bid to replenish fluids.
She scrapped two concerts as she battled to get better and Rihanna reveals her recovery was blighted by anxious calls from her bosses over the completion of her album Talk That Talk.
In a new video documenting the making of the album, she says, "This is the craziest schedule I've ever been on in my entire life. One morning I woke up and started f**king crying so hard. I finally just got to my bed from the IV and I was just like, 'Good I can actually get to sleep tonight' because we stayed up (all night) and I finished (the album) at 5pm the day before.
"So now I'm like 'One good night of rest'. I get in bed and it could not have been two hours in before my phone started going off. I was so frustrated that I kept ignoring the phone. Every time it would go off but every time I would ignore it. It would be another burden on my shoulders 'cause I know it has to get done.
"I know I'm sick but I'm the only person that can get it done so it was so frustrating.... I was so angry, I was so overwhelmed that I was sick it felt crazy.
"I started crying. I cried for 10 minutes really, really hard in my pillow... It was aggressive. I don't cry loads. If I cry it's because I'm very angry and I can't do anything about it, because I've run into a dead end, like nothing you can do about a situation, that's when the tears would come down. But this time I needed to hear it, I almost wanted to punch somebody."
However, Rihanna eventually realized she would have to get back to work.
She adds, "(I) got up, and I showered and started to work. I wrote all my thank-yous (for the album sleeve). I thought, 'They don't have a choice. I'm the only person they can get answers from and there was nothing I could do about it'.
"But I was so overwhelmed and the emails coming in were so inconsiderate. Everything that was going on with me (with the drip) was complete disregarded (sic) with everything that had just happened prior."
Rihanna prompted fresh fears for her health this week (begs07May12) after tweeting an image of her arm attached to an IV drip.