Background: last thyroid results just over a month ago were: TSH: 3.21 (range: 0.35-3.5); my serumfree T4: 10 (8-21) & my T3, which I know is the most important of all being the bioavailable hormone was 3.4 (3.8-6), so just 'below range'. About six weeks ago the TSH had been similarly high, the T4 slightly lower. A fortnight ago I got results for thyroid peroxidase antibodies which were ok: 8.6 ku/L (0.0-34.0). There was also a B12 deficiency. My main GP wasn't obviously loathe to help, but said that 'from where [she] was coming from' (in rather American parlance) I'd had stable tho' similar TSH results for years and that as there wasn't a deterioration, she was more inclined to be in 'monitor' mode rather than prescribe. My question is a little embarrassing, and I know a lot of the posters on here are women tho' very knowledgeable and non-judgemental ones, so I'll just spit it out. I've been having issues with ED and libido over the last few years for which I purchase and selfprescribe moderate amounts of the blue pill. This is rather an emotionally debilitating state of affairs, especially when I'm not entirely sure why it's happening, and I do wonder if my low T4 and T3 might be contributing to this. Would anyone please give me their educated opinions on this? If hyperthyroidism was responsible, what's the basic endocrinal process at play here? Would an underactive thyroid deplete testosterone production or would it be more generalised fatigue? I have read a medical study online that concluded that treatment for hypothyroidism did in some cases resolve libido and ed issues. I also have much longer refractory periods between being able to 'raise more than a smile' - a week, maybe longer - than I used to, and as I've said I come to rely on chemical assistance. As regards other symptoms, I do feel totally zonked come early evening and sleep like the dead most nights. A bad night's sleep and I'm wasted all day. But on other hand, I'm not fatigued all day. I also experience minor muscular ache when I wake up tho' I do shake this off. I'm 38, am fairly active tho' maybe very slightly overweight, but honestly only by a stone at most. I used to smoke and drink quite heavily, but have been abstinent for some years now. I expect some decline in the bedroom due to age, but it seems too much of a coincidence that I'm subclinical hypothyroidic and having these probs, but maybe I'm putting 2+2 together and getting 5, I don't know. Only the last few years , my libido has been on and off tho on a downward trajectory, but I've often felt like something inside was on the fritz, working sometimes and not others, non-linear . Many thanks for any answers to this sensitive post.