Thankyou for the replies. Yes I guess every Dr seems to have a different theory, mine def attributes a lot to my tiny frame and being underweight, including my early meno, I guess he may have a point!
One annoying thing that could also be due to being tiny is that on the Oestrogen Gel, I find that if I do not use it at a regular time, the other night I fell asleep and forgot to apply it, so in effect, I missed a day, I inevitably end up with a breakthrough bleed, argh! My Dr seems to think my body is quite senstitive to the Oestrogen, not sure but it has happened on every ocassion that I have forgotten to put it on, yet the pharmacist said that some people only use it every other day, that would def not work for me!