High normal T3 but continuing symptoms esp. breathing problems

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Hi all, am new here... a bit about me:

I'm a 20 year old female and have recently been diagnosed with hypothyroidism

following years of generally feeling ill and 3 months of constant (literally

24/7) breathlessness and chest tightness (it's difficult to draw a full breath

and hurts when I do get it), which is still ongoing despite beginning thyroxine.

I've been at 75mcg for 5 weeks now. All other causes for shortness of breath

have been excluded. I've just had blood tests done for T3 and T4 which have come

back as being in the 'normal' ranges. My TSH is now down to 4.94 (it was 8.49)

but I still feel awful (can't walk quickly, dance, laugh, talk too much, sleep

very well as my chest is just so tight) and my GP is unwilling to do anything

else, saying my bloods are normal.

I've read a good article written by Dr Lowe about adding T3 when you have

hypo-induced breathing problems but as my T3 (4.9) is in the high normal range

(I think, as I'm unsure of the reference range) would adding it benefit me? I

just don't know what the issue is.. is my body just not utilising the T3?

Because it doesn't seem like I'm having conversion issues due to it being 4.9.

Maybe dessiccated thyroid would help? I just don't know what route to pursue! Or

do I need to give the thyroxine more of a chance/increase the dose?

Sorry for the essay, am just desperate for any advice as the breathing issues

and others are making my life a misery..

Thanks, Jess