You are under medicated to have TSH 4.12 when taking Levothyroxine and T3. Your GP or endo should increase Levothyroxine or T3 dose until TSH is 1.0 or lower. Read Treatment Options in thyroiduk.org.uk/tuk/about_... Email louise.robert@thyroiduk.org.uk if you would like a copy of the Pulse article to show your GP.
I doubt that adverse reactions to OTC medicines are thyroid related but it seems fairly common to develop food allergies. They may resolve when you are optimally medicated on T4 and T3. Menstrual cycle will also fluctuate when you are under medicated and thyroid symptoms often feel worse during the menstrual period.
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