I am sorry to hear about your current situation. It can be very frustrating especially when there is no explanation. The same thing has happened to me as well but I was on methimazole. My endo just said “it’s possible to have a mixed process of hypo and hyperthyroidism (having both stimulating and destructive antibodies). I have recently been put back on methimazole after being on levothyroxine for the past several years.
I hope you are able to start feeling better soon.
Reply To: Graves’ disease but going hypo after treatment?graves152021-03-10T21:58:45-08:00