Connor Strange was bullied online for four years and told ITV News Border that it had "a massive effect" on him.
He says he was traumatised by threatening messages which wished death upon him.
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Early enquiries suggest the men may have taken the drug Blue Valium. Two of them remain in hospital with breathing problems.
More than 8,000 people are expected to attend over the three day event, which starts at 7pm tonight.
The local MP and leader of the Liberal Democrats says it was a "joyful" day for locals and former locals alike.