TSH >2.0 indicates your thyroid is beginning to struggle but FT4 is over half way through range which is good. NHS is unlikely to diagnose hypothyroidism until either TSH is >4.5 or FT4 is <7.0.
Supplementing 200mcg selenium is good thyroid support.
Your other blood tests are all within range. Unless you are experiencing breathlessness or fatigue I would accept that 48bpm is a healthy heart rate for you.
You could try thyroid supplements available online.
Thyroid function usually declines but it may be years/decades before you become hypothyroid. Your GP is unlikely to test further while TSH isn't abnormal but you could test privately to see whether thyroid peroxidase and/or thyroglobulin antibodies are positive which would increase the likelihood of developing hypothyroidism.
Hypothyroid symptoms are non-specific and can be applicable to a number of things. Low/deficient ferritin, vitamin D, B12 and folate can all cause the symptoms. If your GP won't test you can order them from the link I provided.
A preservative free eye drops or gel will relieve dry eyes.
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