Like a pp said, it sound like you've made your mind up, so not sure what you're asking.
If your blood test results come back saying 'x', doctors will try and treat you for 'x'. There isn't always an underlying treatable reason for thyroids playing up. Every doctor I have asked, as well as a naturopath has strongly advised not to use the dissociated thyroid and use thyroxine instead. I was hesitant to take daily thyroxine as I didn't want to start taking a drug I would have to take for the rest of my life, but it is what it is. If you want the symptoms to go away, you need to treat them, predominantly with medication.
I have found my Hashimotos is a lot less noticeable when I take my thyroxine (50 one day 100 the next) and cut gluten and sugar out of my diet.