20mg is quite a high dose to start on, so if you feel ok'ish after the first dose, you should be ok over the next couple of weeks before it really starts to do it's stuff.
One dose of 20mg all but killed me in the beginning, so I dropped down to 10mg and stayed on that for 5 weeks.
I worked up slowly to 20mg and had been really well on that for a couple of months before last week's minor blip (depression, more than anxiety, and tied in with my young children's problems and money worries - so not unexpected).
Are you taking it for anxiety, or depression...or both?
My anxiety started after a couple of years of hell, during whichI was carjacked at knifepoint and my father spent 6 months in ICU, before having his life support switched off.
It was my stomach problems that eventually tipped me over the edge...hence why I'm hoping for some closure from that particular problem.