This is a horror scenario and I must say you are admirably calm about this. I have used the Exodus conversion feature myself. After such a length of time surely something is wrong. Are you on windows? It's strange there's no history of it leaving the wallet. Usually the exchange feature has a log. Suggests this may be a bug rather than a hack. I can't suggest anything I'm sorry as I've not seen this issue before but very keen to hear more about it. Resteeming in the hope someone can help you!