This is so true, and its important you take that in because in my experience, GPs simply have little or no idea at all (at least your GP admitted as much in this case - most just made assumptions and wing it), that ME has a big immune system component. But this is vital, beacause people with immune depressed systems are treated very different with almost everything medical, including vacinations, because their system potentially cant cope. So, whereas a normal person can deal with these things, no problem, we cant. Unfortunately though, most doctors place us (Erroneously) in the normal category, and so all their decisions regarding you are misguided and potentially dangerous. Be pleased with yourself, because you have gone away and asked the right questions and armed with the knowledge you now have you can make an informed decision. By the way, if you decide not to go, to help you deal with missing out. Make sure you look at it the other way around: you are not missing out on this trip, you are avoiding being much more sick, for much more longer. Its like side stepping a bullet.