Just to clarify the point about systemic absoprtion, there is no question about whether the estradiol in Vagifem is absorbed systemically - it is! However following the initial loading period ( 2 + weeks depending on degree of VA) the tissues are sufficiently plumped up for this to be minimal and therefore side effects should also be minimal. Dosage must be kept up for the tissues to continue to remain plumped up.
It is possible that for some women 10 mcg simply isn't enough to keep VA at bay and this being the case, more would continue to be absorbed. Nevertheless the amount absorbed is minimal as I said ( as I've read!).
I wouldn't have thought that side effects would present themselves in the first instance 6 weeks into treatment, because systemic absorption is greater initially
Personally I would carry on with it (Vagifem) and see if the IBS clears anyway, if you are able to take something to help with any pain if it's bad....
Hurdity x