Marty 1468 - the usual caveat of discuss your medical issues with your AME/GP applies, but from what you've posted so far, it is likely that the need for treatment of hypothyroidism in your case will be lifelong.
It's very unlikely that your condition/treatment will affect your life in any adverse way, (bit of a generalisation I'm afraid.), other than having to remember to take your meds. Regular monitoring is the key to successful treatment, and once stable, you will require blood tests once or twice yearly.
Does anyone know how thyroid function (either Hypo or Hyper) affects your health besides feeling tired or having a fast/slow heartbeat?
The list is endless, but the aim is to keep your thyroid function normal! So keep taking the tablets unless otherwise advised.
And remember to claim for your free prescription pass
Cheers and good health....ginge
(Sorry just noticed you live in Aus, do you have to pay for your tabs there?)