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An interesting read. It is true that sterling will crash immediately after any vote to leave. That is an absolute given, so on exchange rates, yes, goods and services will be more expensive abroad. I suspect the fall against the dollar will be far more noticeable as opposed to the Euro, though.
It is true that the UK has a number of health agreements with other countries, but not with EU countries as EU Rules apply. That means the UK would have to negotiate with each and every country - or, just remove the principle of subsidised healthcare when abroad. If that were the case, we would all have to take out private health insurance, which will be much more expensive than it is now and in some cases for people with pre existing conditions, almost impossible to get.
It is one of the areas where I feel a very negative impact, as it happens. Put simply, the UK imports people who are of working age and don't generally use healthcare. In return, we export hundreds of thousands pf pensioners who do use local health services abroad. In all of this, the individual loses rather than the Government.