The 30-year-old shot stopper drove himself to hospital one night as his glands were so swollen he was unable to hydrate himself and ended up spending three days on a ward hooked up to a drip.
He's now back in full-training again after losing five kilos in weight and wants his fellow professionals to appreciate the severity of coronavirus and to take appropriate safety measures against it.
Speaking on 'The Sports Desk' podcast, he said: "I ended up driving myself into hospital about 11 or 12 o'clock at night, just so I could get hydrated, because I wasn't able to swallow with my glands so swollen.
"I was severely worried.
"When it was at it's worst…I didn't want it to affect my breathing.
"I knew that if I could get in and get on a drip and get the food and water into myself, I'd be OK but there's always a thing, in the back of your mind, that if it does get into your breathing, then you are in serious trouble.
"Obviously your family's panicking."
'I had awful fatigue for weeks.
"It was probably two or three weeks, even after I'd been diagnosed, that I was still going home sleeping in the afternoon for two, three hours and then after probably 9-10 hours at night.
"I had nearly every single symptom, I think.
"The hot and cold, diarrhoea, everything, it wasn't nice.
"Weight wise, I wasn't able to eat or drink for three or four days, so I ended up losing about five kilos.
"I don't think Lucy, my partner, could believe just how gaunt I was in the face and how much weight I had lost."
His words of warning come with the Premier League preparing to send a video to clubs which features the government's deputy chief medical officer Professor Jonathan Van-Tam urges players to get vaccinated.
Darlow does suggest that the one good thing to come out of it was that some of his teammates who'd previously being averse to getting the jab went and got it after seeing how badly coronavirus had affected him.
He added: "I think seeing how I was probably convinced them to go and get get it done.
"So it's tough, because everyone who isn't having it has their own reason, and sometimes it's hard to convince or go into deep conversation with your team-mates about getting vaccinated if they have a very good reason, and you can't force it upon people."