High TPO antibodies means yes you have Hashimoto's, you may find adopting 100% gluten free diet can really help reduce symptoms, and lower antibodies slowly over time too.
Very common with Hashimoto's to have low vitamins & minerals. The gut slowing down and gluten compromise absorption. Suggest you ask GP to check levels of vitamin d, b12, folate and ferratin. These all need to at good (not just average) levels for thyroid hormones (our own or replacement ones) to work in our cells
You will see, time and time again on here lots of information and advice about importance of good levels of B12, folate, ferritin and vitamin D, low stomach acid, leaky gut and gluten connection to autoimmune Hashimoto's
But very unlikely your GP will be aware of gut & gluten connections. They certainly don't treat Hashimoto's, only the subsequent low thyroid hormones.
If you can not get GP to do these tests, then like many of us, you can get them done privately
Medichecks have an offer on some blood tests if ordered before end of Feb.
More info about diet & gluten
Excellent free web docu-series re-running, starting March 1st