I too have hasimoto. Thank you for that information it has helped me alot. I get the heart thing too. It does seem to be with the thyroid thing. I have a endo that just says take the meds and that is it. this info helps be stay calm when i get symptoms that scare me.
Do you have the chest flutters as well? I have those quite a bit, or actually used to have them. They gave me 1/2 of a Klonopin tablet to take at night, plus Lunesta so that I'd get a good night's sleep. A lot of stress comes with Hashimoto's Thyroiditis just knowing that there's something "attacking" your body and there's no way to stop it.
I've heard only bad about Synthroid (Armour Thyroid is a natural choice, and my close friend swears by it) and when my Endo said Synthroid was going to be the route we were going to go if we needed to, I was like "no way". I've gotten very picky about what goes into my body. When I had the chest flutters, the Cardio doc tried to put me on Toprol and I honestly would wake up in hysterics. My heart would race and BP go up, then the Toprol would kick in and I'd end up crashing. I finally told him I was NOT going to take the stuff, that I felt it was all related to the Thyroid and walked out never to take another one. He kept telling me I "had to be on it" and I frankly said "You're working FOR ME... I'm not working FOR YOU as a guinea pig. I'm NOT taking the medication, period". I was very upset that he would try and force me to do anything.
Sure enough, when they did a fine-needle aspiration and got the growth off my thyroid (which was a very large cyst with dead thyroid cells in it) I started doing better. Never went on Thyroid meds. I DID dump my primary care and got into one that listened to me and wasn't a pill-pusher. She, along with my Endo and the much-embarrassed Cardiologist, agreed with my nutritional doctor (whom I found online of all places) to put me on b12 and lipotropic injections and/or pills. The b12 was to help me with the low energy and the lipotropic is mix of amino acids that help support the liver and move out the fats and toxins that are trapped in the fat. I also do 150mg of CoQ10 every day to help with muscle cramps that come along with the Hashi's disease.
The chest pain (from my experience) is the Thyroid antibodies doing a number on the Thyroid and a lot of times the chest pains "mimic" heart problems. What it actually was for me was my stomach was producing excess acid which would do a "silent reflux" and since those organs are all close together... the heart would be bumped (for lack of a better word) and the flutters would happen. If I'm dehydrated, they are much worse. If I eat cinnamon... they're worse. Caffeine.... same thing. I just had to relearn my body.
My advice is to get your doctor to LISTEN to you... and if he/she doesn't, move to one who will. It's a pain, but well worth the effort. I feel better today than I have in the past 18 years.
God Bless.