A lack of sleep and long hours destabilised Curtis's epilepsy, and his seizures became almost uncontrollable. He often had seizures during performances, which some audience members believed were part of the performance. The seizures left him feeling ashamed and depressed, and the band became increasingly worried about Curtis's condition. On 7 April 1980, Curtis attempted suicide by overdosing on his anti-seizure medication, phenobarbitone. The following evening, Joy Division were scheduled to play a gig at the Derby Hall in Bury. Curtis was too ill to perform, so at Gretton's insistence the band played a combined set with Alan Hempsall of Crispy Ambulance and Simon Topping of A Certain Ratio singing on the first few songs. When Topping came back towards the end of the set, some audience members threw bottles at the stage. Curtis's ill health led to the cancellation of several other gigs that April. Joy Division's final live performance was held at the University of Birmingham's High Hall on 2 May, and included their only performance of "Ceremony", one of the last songs written by Curtis.