Sjb says she is on Evorel sequi so not possible to change strength without changing product.
Sjb - definitely sounds like too little oestrogen if your flushes have come back, It would be unlikely that a 50 mcg patch would ever give someone too much oestrogen. It would help to know where you are in menopause ie what your periods were doing before you started HRT 2 years ago and how old you are? Oestrogen flcutuates wildly during peri-menopause but as you get further towards menopause, overall, levels begin to fall and then in the 2-3 years following the last period, fall dramatically until they reach a low level.
Although you won't know when you become menopausal as you are taking HRT, you should be guided by your symptoms, and return of flushes are the most obvious indication of insufficient oestrogen.
Depending on your age, your options are to now take separate oestrogen and a progestogen which means you can increase the patch dose to 75 mcg. Norethisterone (the progestogen in Evorel sequi) is not available separately for HRT, nor at the right strength but there are other options listed here:
https://www.menopausematters.co.uk/to_progestogens.phpBascially - Utrogestan ( "natural" progesterone), Provera or the Mirena Coil, or if you are young there is Qlaira the contraceptive pill which contains a form of estradiol but will regulate the cycle and prevent the fluctuations of peri-menopause as well as providing contraception.
Hope this helps
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Hurdity x