Hi Silverkins....welcome back! Like you i have an underactive Thyroid and Parky.I started with an Overactive Thyroid in the early 90s and was very poorly with weight loss, increased appetite and shaking and generally everything speeded up! After 2 years on meds i was given radioactive iodine at the Hospital which was uptaken by the thyroid gland and after a couple of months noticed the signs of underactivity.......weight gain! tiredness, no appetite and woozy head, heavy limbs etc. Since then i have been on a daily dose of 100mg of Levothyroxin and have an annual blood test. The blood test range for a normal Thyroid is large and i find that although the test always comes back "Normal" if it is at the lower end of the scale i generally feel the underactive symptoms and feel a definite improvement if i am at the higher end, though as i say it is still in their eyes "Normal".
In the USA they believe that taking the temperature is far more effective to diagnose an underactive Thyroid than a blood test, but it appears that is not the case here.
I am pleased to hear that you are feeling better and found out what was causing you to feel so poorly....Parky is enough to cope with without all the added bits ay?!!!