By Simon Bird Eddie Howe has vowed to ride the rollercoaster nature of being Newcastle boss – and says criticism “fuels” him to do a better job. Howe is the latest manager to cope with the extreme conditions of bossing the Toon. The good times sees manager and players hailed as world beaters, but blips in form mean they are immediately under pressure as a one-club city searches for answers. Howe insists the season is not a write off, with a tough January programme starting at Liverpool on New Year’s Day – and a key FA Cup tie against Sunderland next weekend. They haven’t beaten their big riva…