Still have some symptoms of hypothyroidism despite normal TSH , T3 and T 4 levels?

buy synthroid

I am on replacement thyroxine since 2002 and have normal TSH,. T3 and T 4 yet still have some symptoms of hypothyroidism
mainly,
1) Heavy prolonged periods which are sometimes irregular.(late or early)
2) Memory loss
3) Unable to lose weight
4) Tiredness
5) Low iron levels
6) Sore joints
7) Foggy mind
8) Depression

Why is this so?
Ive even had my meds increased(still withiin good rang in blood levels)

ibuprofen 400mg

i have Hypothyroidism...but?

i am taking thyroxine, have been for about 6+ months now - how long until there should be an effect, i still seem to be really tired and my nails and hair is brittle - apparent symptoms of low thyroid levels..so how long until i notice a change in my health?

valium