It is still very much early days Hun. In my previous experience ven takes a good six weeks to work properly. However I'm convinced that the stress and anxiety of trying a new med exacerbates the side effects. I always get really worked up when I have to take something new. Being on holiday meant you were already a little more relaxed. It was an escape from anxiety for you and that's probably why you didn't suffer badly with side effects. Now you're at home you're worrying about it a bit more.
Also it sounds like you doctor ramped up your dose pretty quickly, which may not have helped. I always have to increase very slowly or I feel terrible.
Stick at it. The side effects do pass I promise.
Sara xx