Went to the GP about something else, went for a blood test, iron levels very low, went for another blood test to be sure, iron levels even lower. One of the iron compounds that should measure around 80 mg/l (I think it's mg/l) measured 5! We went through various triggers for anaemia (diet, pregnancy, menopause, accident/heavy bleeding and others which I've forgotten) and none of them seemed to apply.
GP has put me on ferrous sulphate tablets for 3 months and told me to go back for another blood test, with a view to more iron tablets for another 3 months and so on for a year.
The good news is that now I know why I am knackered all the time! Not just working and 2 primary school aged DC! And I try to keep fit.
My Q is.... will iron tablets really take 3 months or more to kick in? I've entered a 60 mile bike ride in a couple of weeks time. I'm usually more than capable of doing 40 miles, and am limited by time rather than anything else. But this weekend I'm wiped out by 7 miles with the DC!
I'm 46 but still have light, regular periods. I don't eat meat, but do eat lots of pulses, beans and greens.