With all due respect, as I know you've bad huge problems but why on earth do you have to self-medicate. Surely if they have now identified the problem, you should be treated within he NHS. Sorry if I missed part of he saga but I'm genuinely interested as my Mother is borderline under-active thyroid.
I know you've been cagey about it in the past c-g, but I really would be interred to know the name of the drug you are having to buy, as t4 and t3 are both available on the NHS.
OK, I'll try to explain. In the UK the thyroid is tested by means of the TSH (thyroid stimulating hormone)test and a measurement of over 10 is considered to indicate hypothyroidism.
In Europe and the USA, the measurement has been reduced to 2.5.
My TSH was under 10 and was told that I wasn't hypothyroid despite having many of the symptoms. Apparently I was depressed and I strongly disagreed with this. Then I was told I was menopausal to which my reply was 'check my records'.
Now to the science bit ... the TSH test has been questioned by many physicians who claim that this test will not show if you are converting enough T4 into T3, or your thyroid is being attacked by antibodies, or you have T3 receptor resistance, or you are suffering from adrenal insufficiency, or you're deficient in minerals and vitamins that are essential for thyroid health.
So ... despite at my worst sleeping for 12 hours at night and sleeping again during the day, walking up or down stairs exhausting me, having a croaky voice and brain fog being so bad that I couldn't string two words together, giving up riding, it was not due to my thyroid because the TSH test said my bloods were 'normal'. Clinical symptoms were completely ignored.
I knew I was hypothyroid and did persuade a GP to prescribe a month's supply of thyroxine but it was only the lowest dose. I actually felt worse then was informed that it definitely wasn't my thyroid, was pointless increasing the dose and taking it for longer.
Dr P - yes, thyroxine and T3 are available on the NHS but any Endocronologist has to follow NHS guidelines and that includes a maximum dosage level. I understand (from those bloomin' internet forums) that some GPs are not happy to monitor patients taking T3, let alone taking into account the high cost and do indeed refuse. I do buy my own T3.
Going back to the original topic, as can be seen from my comments I do believe that the reason for some of the obesity is undiagnosed thyroid disease.
My brain hurts now but do hope that this makes sense! Happy to answer any questions.