Try reading before you down vote.

Speaking only for myself, what really threw me off was the following:

Apologies if you’ve already tried this or something similar, it doesn’t work for everyone, but I got mine back by using essential oils to restrain [emphasis mine] my olfactory system.

I think that if I'd realized that you meant to say "retrain" here instead of "restrain", I would not have been so quick to initially dismiss it as obviously nonsense.