Opps - in my above tests I worded wrong. I meant to say Free T3 and Free T4 tests.
Your histroy and symptoms sound very similiar - I was in your shoes for many years after RAI to ablate my thyroid function for Graves.
Here are some key points I found that can share with you.
1 - Definately have 3 specific tests done on your thyroid levels. A TSH - Free T3 and Free T3. Low Free T3 levels are linked to panic and anxiety for us. Once I started on T3 medication the panic started to leave and my mood balance and clarity returned.
2. Test your VitB's levels. I never underwent a - persay- test for it - but I started supplementing after a ton of reading that once thyroid function is removed within the human body - we are depleted in specific supplements. I found these very helpful to end that horrible panic.
a. Vit B complex - liquid complex - not pill
b Zinc 60mgs/ w Copper balance
c Selenium 200mg
d Vit C 2000mgs daily
e Magnesium citrate
I also added a probiotic for digestion. I got tired of taking so many pills and stuff I recently went to two supplement drinks. One is called EmergenC which is packed with detox supps and the other is specifically designed for hypoT patients - mostly ones with no function. That is Fatigued to Fantastic supplement packages. This holds everything in it (except the VitC) to support thyroid ( meds) and help with symptoms.
I feel for you and I did lose a job b/c of the panic you describe. In fact I couldn't even grocery shop during that period. It's debilating and can ruin a life. 99% of thyroid patients get the DX of anxiety and get stuck on drugs. I was a Xanax freak for 4 years and no one helped except they kept increasing that med.
The withdrawal was God awful and took weeks to get off ---- and I do not support antianxiety meds AT ALL. I was a zombie, yet still suffered the attacks. The only thing was --- I was so NUMB - so I didn't care anymore.
Push for that testing above first - start a supplement package, especially the B's. It may do the trick for you.
If you find you are low on the Free T3 test - push for a T3 med in addition to your Levo. You can eliminate this anxiety and the other symptoms that go along with hypoT if you speak up.