Hi Carole,
After being diabetic for so long I just kinda know what an average portion is and how to adjust my insulin for it. If in doubt you could take x u it's of insulin with your meal, test half an hour, an hour later and give a correction dose if necessary.
I find that travelling can cause my sugars to become a little erratic, especially where long haul flights are concerned. However, there is absolutely no reason why you can't enjoy a holiday because of your diabetes.
Why don't you try doing an experiment at home? Don't weigh your food for a week. Just use the books and best guess approach. Try and adjust your insin accordingly. Tansy way you're still at home but applying 'holiday rules', so to speak. Just an idea.
Em