Personally I feel that Nick had a bloodwork/health problem. Something on his bloodwork might have been very dangerous causing him to stop whatever supplementation he was doing. On ther hand Nick might be having a problem with his health, kidneys, liver, spleen, blood thickness, etc. from whatever supplementation protocol he's following.
To have the IFBB let him out of a contract to do the Olympia he needs to show that his health was at risk.