Morning all!
Really good night's sleep here (sorry all of you with fractious or otherwise children
) and didn't have to get up for a wee, despite drinking around 3 litres of water.
The caffeine thing is interesting - in Atkins first edition of "The New Diet Revolution" he said not to drink it, but by the next edition he said it was OK. And different low carb books/plans are all contradictory as to whether they recommend it or not.
So I think it's one of those things like dairy - it may be harder for some people to tolerate than others.
Equally, the idea that the menopause makes it harder to lose weight is also something that's debatable. Certainly when I first started doing this and lost 2 stones it was when I was peri/menopausal. Being totally honest, I know that if my rate of loss is slow, it's usually down to me not doing it properly rather than being menopausal 
Re omeprazole, I found a link to this forum
I couldn't find anything from medical sites, however. (Although I didn't search for very long - you might want to have a look yourself to see if there's anything more substantive)
But don't stop taking something you've been prescribed on the basis of some anecdotal data! Presumably your condition will worsen without it?