I love essential oils, too. I have not used them as much this past year, just because it has not been very convenient.
I hope to get back to it. I also use them on my body in carrier oils. My favorite carrier oils being jojoba and almond.
I am glad you have mentioned these, fern. Many diffuse lavender for anxiety/relaxation, and sleep.
I love peppermint and myrrh. Myrrh is often used in spiritual "initiations."
There are many I cannot use because I react to them in a bad way.. I react to many substances/scents, even "natural" ones.
AkA: "Environmental Illness/Multiple Chemical Sensitivities, etc.

In general, I have seen essential oils be very helpful to many.