Hi there Loo53
Tiredness is not a side effect of testosterone - quite the reverse so maybe your tiredness was coincidental? However if it gave you a stabby migraine type headache - this
is associated with fatigue ie the migraine. Migraine is a potential side effect (as reported for Intrinsa T patches for women - now discontinued).
I am flabbergasted that a gynaecologist could think that vaginal estriol in any way gives you sufficient oestrogen levels in the body. It only weakly binds to some oestrogen receptors ( can't remember which) compared to estradiol, and it isn't even metabolised to estradiol in the body.
It is frankly worrying that someone in this position could think to give you this when androgen levels tend to become more dominant in post-menopausal women! Here is a leaflet about T replacement:
http://www.chelwest.nhs.uk/services/womens-health-services/gynaecology-services/menopause-and-pms-clinics/links/Testosteronereplacementforfemaleandrogendeficiency092017CWAGREED.pdf and some info here:
https://menopausedoctor.co.uk/what-is-the-menopause/testosterone/If you had lots of energy before you started it, and didn't get muscle aches etc after exercise and fatigue then apart from libido it may well be that your levels were not that low? It is definitley not advised to take it on its own in post-menopause without having adequate levels of oestrogen as Dotty and Annie0710 say.
Are you taking any other medication that might lower libido eg anti-depressants maybe?
I am wondering why you went to the gynae in the first place ie what symptoms were you seeking help with if you are not bothered about libido?
I don't think you mentioned your age but Tibolone/Livial would have been a better product to prescribe - because it does give you a type of oestrogen as well as a type of testosterone. it is often prescribed for post-menopausal women as it is the only licensed androgen product for boosting libido!
Anyway - glad you're feeling better now

Hurdity x