Hi thanks for your question.
Since you are on holidays your nausea
could be due to No1 gastritis(inflammation of stomach) caused by taking spicy food and secondly by erratic food habbits during holidays.
Yes you are diabetic diagnosed for first time.
Till you are back home,adopt a healthy life style,avoid all fatty foods and red meat,diet low in sugar,plenty of fresh green leafy vegetables and fresh fruits,like organges,grapes and apple.
Back home,you have get yourself fully investgated by a physician,who may also prescribe medicine for control of your blood sugar.
For gastritis you can take antacids and rantidine,till you are back home.
Hope this answer your question.