Jessie J was left in floods of tears after suffering a panic attack on the "worst day so far" following her breast cancer diagnosis

In a message posted on Instagram, she wrote: "Honestly, had my worst day so far yesterday since my diagnosis and the busiest three months I have had in years. Work. Toddler. Cancer. life etc had my mind [drained].

"'Panic attacks/ tears. big fears/ anger/ overwhelm bad. [sic]."

However, Jessie J went on to reveal she found a very simple way to make herself feel better - eating a corn on the cob.

She added: "And you know what helped?' I ate a corn on the cob. Turns out it's extremely hard to panic or cry while eating one. Highly recommend. Instead mood shift."

Jessie added: "Tomorrow is a new day. The [rollercoaster] of cancer is [draining]. I won't be just talking about the highlights. And making jokes all the time. That isn't real life. Goodnight."

The following day, Jessie returned to social media to explain she's glad she shared her feelings because she felt "completely drowned in all the negative and bad feelings" relating to her cancer battle.

She wrote: IMO. It's [key] to acknowledge fear anger sadness panic overwhelm and let it come up and come out. holding it in won't make it go away. In any challenging situation in life.

"So when I posted what I did yesterday about my current challenge in life, also while making light of the situation. That was one day in 10 weeks that I just lost it and was completely drowned in all the negative and bad feelings any cancer journey can bring. Which is healthy and needed.

"So I will cry, I will be scared, I will panic, I will feel all of it for a minute or even a full day. And then eat a [corn] or listen to a song that lifts me up or laugh with a friend on Face Time. And then go and be a mum, and go to work and show up and be what I feel 90 per cent of the time.

"Strong, fearless, healthy, and make some jokes about it all because that's my way. But i will not ignore the 10 per cent that is fear and sadness".

Jessie - who is mother to two-year-old son Sky with basketball star Chanan Colman - previously revealed she was given the diagnosis prior to the release of her single, 'New Secrets' on April 25 and she has been "in and out of tests" since.

She said in an Instagram video: "Before 'No Secrets' came out, I was diagnosed with early breast cancer. I'm highlighting the word 'early'. "Cancer sucks in any form but I'm holding onto the word early. I have been in and out of tests throughout this whole period."