The 26-year-old manager of Grill'd Scarborough was on a trekking exhibition with his sister when the first earthquake hit and described the event as frightening and violent.
"We were sitting outside our lodge in Dhunche waiting for lunch when the earthquake hit," he said. "We ran out on to the street and the ground started opening up.
"As the buildings shook we knew it was only sensible to run for our lives and exit the town.
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READ NOW"Nowhere was safe with a mountainous rise on one side of us and a steep cliff on the other.
"Rocks, soil and vegetation fell from above us as we left the town gates and tried to look for the safest place to go and then the earthquake subsided – it was the most terrifying two minutes of my life."
The next three nights were spent in a refugee camp and while it was a terrible ordeal, Mr Williams said the open-hearted Nepali hospitality made it completely bearable.
"Some townsfolk were making food for the entire camp, which swelled in numbers and others brought blankets and tents," he said.
"They did all of this with friendly disposition and smiles on their faces, even though some people had lost their homes, friends, families and more.
"I feel indebted to them for all the help they provided during our time at the camp and along the treacherous road back to Kathmandu."
He now hopes a fundraiser on Saturday where $5 from every burger sold at Grill'd Scarborough will help raise much needed funds for the Friends of Nepal charity organisation.
"I fell in love with the country and its people," he said. "My holiday took an unexpected turn in the form of an earthquake and I was lucky to survive but I love the environment and especially the people so much I would go back tomorrow if I could be of more use."
The restaurant manager also plans to hold a separate music event later this year, where funds raised will also go to the charity.