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Normal blood results show - its function is normal. It does not say anything about the structure.
When there is a swelling, you need a scan - ultrasound
scan / RADIO ISOTOPE scan.
You may also need CT SCAN
for the neck - thyroid
swelling with swollen lymph nodes
, needs EARLY and EXTENSIVE INVESTIGATIONS - to exclude malignancy.
You need BIOPSY - lymph node and thyroid (Fine Needle Aspiration).
You seem to depressed and this information may be more depressing...But the wise and only option is to have a proper diagnosis. And that requires investigations. There is no other option. Earlier, the better.
and HEAD AND NECK SURGEON are the two specialists, you have to see.
Wishing speedy recovery