[Everything doTERRA] tendinitis, rotator cuff, or rhomboid muscle strain-Which EO?

I was in a car accident back in Sept. 2012. I've been suffering with left arm/shoulder pain since. It has progressively gotten worse. Doctors first said it was from herniated cervical disc. Then questioned rotator cuff tear, MRI was negative. Then possible tendinitis of rotator cuff and now they are thinking torn or strained rhomboid muscle.  I've tried deep blue and it doesn't seem to help. Recently I've been using marjoram & frankincense and at times it seems to help. I've been doing some reading and wintergreen, basil, cypress and birch have been mentioned. Birch is actually highly recommended. I am a new IPC, about 30 days in and I just realized I can't order birch. How does an IPC get birch. And any other helpful suggestions would be appreciated.

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