Not exactly what you want when you're away enjoying the sunshine, right?!
Poor Olivia wasn't feeling so great while away with boyfriend Alex Bowen in Barbados, but it sounds like all has been cured (or near enough) thanks to a long sleep and the thought of a romantic dinner overseas with her beau.
Sharing a selfie with Alex (and continuing to make us green with envy with their Caribbean getaway), Olivia tweeted: "Sunstroke is not my friend," along with a crying emoji.
She added: "Feeling better now after a long sleep and looking forward to dins tonight."
Taking extra precautions to keep on the mend, Olivia joined Alex at the beach with a cap and a khaki shirt to cover up. But luckily feeling under the weather hasn't dampened her spirits and she recently tweeted: "Most amazing beach, amazing day, amazing boy."
Alex and Olivia have jetted off to Barbados for a relaxing break away, after finally moving in to their first home together.
They had been living together already, as Alex had moved in to Olivia's flat in Essex, but the couple recently bought their first place together and have expanded. They've now bagged themselves a three bedroom house and spent the days before their holiday settling into their new place.
Olivia had previously spoken of her plans to buy a house with Alex with Reveal. She told us: "We're getting a bigger house - three bedrooms - so it's getting very serious. We're going to be saying in Essex and will have a garden for the new arrival.
"We've found someone that has a French bulldog litter due at the end of October and I can't wait for him to be born."
Olivia and Alex first started dating while starring on Love Island's second series. They finished in second place on the show and since returning home, their relationship has been going from strength to strength.
So much so, that the pair are already talking babies and marriage! We're not kidding!
Alex told us that Olivia has already picked out the engagement ring she wants and a proposal could be soon on the cards.
He said: "I've never been this happy. Before I went on Love Island, I didn't even have an idea of when I'd move out of home - now I've got a girlfriend, we're getting a house together and I'm happy.
"I'm not going to say it's going to be a year until I propose because then she'll be there like, 'Erm, it's a year to the day and you haven't proposed!' So it could be less, it could be more. She's already sent me a picture of the ring that she wants though."
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