Fermented over a year? That seems like a really long time. Was it sitting on lees the whole time? That can be an issue.
Generally though, any hot tastes are going to be the result of fermentation issues- temperature, nutrients, ph, leaving on lees, etc. If you post more information about the fermentation it would help! Seems like some meads that are fermented with a lot of fusels can take a year or more to age out. When did you make it and what wa syour process throughout? If it was just honey, water, yeast, with no nutrients or phosphates added, that might've stressed out your yeast.