The QPR striker had to come off in a match against Swansea in January due to illness and, despite returning to training, he eventually had to seek medical help and spent eight concerned days in a hospital bed.
The 27-year-old former Livingston forward, who was raised on the Gold Coast, recuperated and returned to action against Watford earlier this month.
After three appearances for his club, he joined up with Steve Clarke's Scotland squad this week for the upcoming Euro 2024 qualifiers against Cyprus and Spain at Hampden Park.
However, his recent experiences left its mark on Dykes, who said: "It was scary. I had flu symptoms and I played against Swansea and tried to battle on but had to come off.
"Walking into a critical illness wasn't very nice. It went from zero to 100 pretty quick. It was concerning.
"My breathing was heavy, you could see my chest move quite a lot and it was quite hard to get my breaths out.
"It is not a nice feeling. I didn't have any energy and couldn't get out of bed. I couldn't do much.
"I was on antibiotics and medication that week, but it didn't touch it.
"I needed a CT scan and that's when I knew there was pneumonia in my lungs and by that time I was struggling to breathe and it was hard to move around.
"I was in hospital for eight days and it was quite tough. I wish no one to be in that situation."
Dykes has scored eight goals in 26 appearances for Scotland, whom he chose ahead of the Socceroos.
But he said football became of no importance to him during his spell in hospital.
"It opens your eyes a bit. You think about your health," he said.
"The days when I was in hospital and the medicine I was on wasn't working the way they wanted it to, there was no thought about football at that time, it was about myself and my wife and kids.
"After I started to feel better I could think about that (football) again, but at the end of the day it comes down to health and making sure you are 100 per cent."
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