Yes, if you're female then those numbers are even lower than where they should be if you were male. No wonder you feel so crappy!
Re the ranges for FTs will differ based on the unit of measurement, the exact test being used and the population being tested. The new range for TSH can be obtained by visiting the webiste for the American Association of Clinical Endocrinologists and printing off their press releases for January 2004 and 2003. I am not permitted to post the websites but you should be able to track them down on your own with the information provided.
For specific range targets you should check out the National Academy of Clinical Biochemistry (NACB) - they have guidelines for testing and treatment. The guidelines are in pdf format. You're looking for Guidline 23, 26 and 27.
"Guideline 26. Levothyroxine (L-T4) Replacement Therapy for Central Hypothyroidism
- A serum FT4 level in the upper third of the reference interval is the therapeutic target for the L-T4 replacement dose used to treat central hypothyroidism due to pituitary or hypothalamic dysfunction.
Guideline 27. Clinical Utility of TSH Assays (Functional Sensitivity ≤ 0.02 mIU/L)
- When the serum FT4 is low and yet the serum TSH is only minimally elevated (<10 mIU/L), a diagnosis of central hypothyroidism should be considered.
- The majority (>95%) of healthy euthyroid subjects have a serum TSH concentration below 2.5 mIU/L. Ambulatory patients with a serum TSH above 2.5 mIU/L when confirmed by a repeat TSH measurement made after 3-4 weeks, may be in the early stages of thyroid failure, especially if TPOAb is detected.