Your back pain and blue vision may be associated with your hormonal disorder.because you have not gone for
TSH test for 10 mnt which shuold be evaluate after every 3mnth of time period .so firt of all investigate your TSH.
It may be that your dose of thyronorm drug might have change again.
Next Steps
you have to take thyronorm for life long .you can also take homoeopathy medicine to cure hypothyroidism.