Most oils can be used with a burner. However, some should not be used i.e. lavender, if 1 is pregnant
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How about buying some fresh herbs after C.mas? Supermarkets have basil but I cannot abide the smell
. Rosemary, bergamot and orange - they are separate plants. Can be grown outdoors or on a cool windowsill.
Have a look-C at Jekka's Herbs web-site. She has grown herbs to Gold Certificate standard at Chelsea and has seeds as well as advice.
Lemon balm is good in the garden too but it does spread ;-). One can brush against it and it leaves a lovely smell.
Anxiety can also be eased by appropriate medication , used initially daily and then on an as necessary basis. I have also taken Bach Rescue Remedy pastilles or the mouth spray with success. Holland Barratt.
Deep breathing - have you tried laying in bed and stretching/relaxing muscles from the toes upwards? The idea is to do each muscle group as you move up the body ...........