Karinagal, to answer your original question - medical ID is only treaaly needed if (a) you are unable to speak to medical staff yourself, through being unconscious, for example, and (b) it's of the sort of design and in the sort of location they will look for it, and (c) you actually wear it.
If you've never been unconscious through hypoglycaemia nor hyperhyperglycaemia, nor even near to unconsciousness for those reasons, I'd say it's not worth the money. But if you feel it will make you less worried, then, perhaps it is worth it.
I should add, that, even with type 1 diabetes, but good hypoglycaemia awareness and never having needed help from another person, I don't wear any medical ID jewellery, partly because I never wear any jewellery except for a wrist watch (worn attached to neck work ID band so I can wash my hands properly for infection control purposes). When travelling overseas, I always memorise a few words, please, thank you, bread, sugar, diabetes, insulin etc in the local language(s) - actually, diabetes and insulin are roughly the same in all the languages I've encountered so far in Europe, Middle East & Latin America. When I was knocked off my bike by a car door (less than 1 mile from home), I told all the people who helped, passer-by, then ambulance staff, then A&E staff, that I had type 1 diabetes, so that if I did lose consciousness, they'd know, but I stayed conscious until the general anaesthetic. So, talking can be a good substitute for medical ID jewellery.