Should I continue thyronorm? Dosage?

I'm 27 F. Been taking 25mcg thryronorm since 2012. Started medication with 50mcg which was brought down to 25.been taking 25 mcg since 4years or so with thyroid levels in normal range since last 3 tests. Last test was taken 2 years back. But around 16 march 2017 I stopped taking medication because I developed sudden palpitation and anxiety. Got a body profile test done on April 15th 2017 including thryroid. Thyroid levels were: FT3 4.21, FT4 12.28 (pmol/l) and TSH 4.96 UI/Ml (please note I was not on thryrorm during this period). Otherwise, B12 and vit D were low and I've taken 2 injections for the same so far. Palpitations stopped a while back, anxiety is rare. Generally feeling okay. More energetic after B12 I think. But today I noticed some unusual hair fall, that's it. So was wondering if I need to get tested again/start meds/if yes, dosage?