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Low thyroid function can make you tired, depressed. It also lowers libido and can lead to fat gain. Most cases of low thyroid function are caused by iodine deficiency from not using iodized salt.
TSH should be near 1.0
Thyroid lab ranges are quite useless.
fT3 and fT4 should be near midrange.
fT3 looks like it is good.
fT3 is the only active hormone, there is no T4 receptor.
Are you taking birth control pills. Some women have lower libido from those.
Prolactin might be elevated, need to see the lab range.
Energy involves many factors. Thyroid and cortisol are important. Cortisol is best as ‘AM Cortisol’ done at 8AM or 1 hour after waking.
Diet: Many there have issues caused by a lack of protein from not eating milk and a diet that has too many starches such as rice and bread.
Do you get enough sun on your skin to male Vit-D? Some avoid sun to have a lighter complexion.
Do you have any digestive issues?
Some areas in India have problems from natural levels of arsenic in well water. https://en.wikipedia.org/wiki/Arsenic_contamination_of_groundwater
Did you live in any affected areas in the past?
DHEA: DHEA does not typically make T levels any higher in men, but can in some women and this can lead to more facial hair. DHEA levels are highest in age 20-30 and taking DHEA is really not called for. DHEA levels start to drop after age ~35. DHEA will not do anything for energy, concentration and weight - thyroid is the problem.
I think that your tiredness is the key to problems and libido. Libido is really tied to ones health and vitality. We see lots of problems with TSH=~2.0
If fT4 is below mid-range, that also indicated iodine.
With good fT3, TSH=2.0 suggests that fT3 is ineffective. Then we suspect that reverse T3, rT3, might be elevated and blocking some fT3 at T3 receptors. fT3 can be elevated from stress events and stress conditions. Please read the thyroid basics sticky for references to stress, adrenal fatigue. If rT3 is elevated, cortisol can be elevated but can become low as the condition progresses.
You are definitely a different women and you cast a large net looking for information.