Hi there. This was a question I asked myself before I departed on the 3 week holiday to Utah I'm just about to return from. All the websites advocate a GP's letter. Mine charged me £15 for the pleasure as it's "not medical" (confused by that statement as they put me on the drugs I'm on - not me!). But there you go. I have yet to be asked about it but better to be safe than sorry - especially as I am now a once-a-day insulin injection man. Definite sharps issue there!! If you can, take a sharps bin with you to keep in your hold luggage - alternatively you might find that at local police stations to you they have sharps collection points (mainly for drug users but ask and they could probably oblige). Also, if there are more than just you travelling ask someone else to carry spares of your required medication. I spoke with my local, VERY helpful pharmacist, two weeks before leaving and they arranged my GP to sanction an extra supply of required meds (i.e. I had double supply). I realie not all pharmasists / GPs will be as helpful, but if you don't ask you don't get.
As to self-testing I've continued with it and, like a previous postee, have been pleasantly surprised by the results - again heat has probably played a factor in this. Up over 100 deg F, so not exactly up for a banquet - just more sensible eating, drinking plenty of water etc. I have also been very surprised by the volume of "diabetic" products (food and otherwise) available over here. So long as you are careful and check the packets you should be okay.
If you are self-catering I can heartily recommend the following:
http://www.quakeroats.com/products/hot- ... sugar.aspx
Don't be put off by the names of the product - check the boxes and compare (especially the carbs). Yes there was a small spike in my testing but nothing more than normal (i.e. 0.4 - 0.6 increase). Don't be fooled into the "reduced sugar" version. They have more in them than the Weight control ones I've tagged above. Unfortunately Quaker don't sell these in the UK nor do they currently plan to (hmm - Twitter / Facebook campaign opportunity?) - they confirmed this in an e-mail to me this morning.
End of the day, relax, continue as normal and make sure your paperwork is organised. Then enjoy!!!