I had the exact same thing recently - I also have Hashi's and got a swelling on my thyroid for a few days (maybe a week
), with a shooting pain that travelled up the right side of my thyroid, up my neck and into my right lymph node by my ear, kinda like being stabbed with a pin.
I had a blood test and I had indeed gone hyper due to a hot nodule - bearing in mind I was on 75mcg levo at the time. I reduced my meds down to 25mcg on instruction from Dr S and then stopped them completely for about a week had another blood test and by that time I had gone quite hypo again!
I had an ultrasound on the thyroid and the hot nodule had passed (although I apparently have lots of small nodules in my thyroid).
So - what I am thinking is take your BP and pulse - my pulse raced when I was hyper. Book yourself for a blood test, they should get the results back to you quite quickly if you've gone hyper.
The GP *might* want you to come off of meds completely if you are hyper but I would insist on having a follow up test a couple of weeks later as my levels changed dramatically quite quickly.
Generally being on meds is meant to calm and prevent this kinda thing happening but as far as I can tell it still will to some degree - might be a case of reducing meds and then see where you are - if you can feel a lump on the thyroid at all discuss with your GP about the possibility of having an ultrasound on it.