I do not have diabetes but I have had the distinct pleasure of having many hypos, not that I was aware of them at the time. However because of the nature of mine, it would be remiss of us RH ers to have the sugary drinks or the sweets, glucose remedy for hypos. Because of the rebounding hypers and hypos. Once we hyper, we hypo. So what it all comes down to is that the best way to treat a hypo is not to have one by not having a hyper!
But, if we do have a hypo, one or two plain biscuits with a cup of tea or coffee, to slowly bring up your blood glucose levels slowly followed by a very low carb small meal to keep your blood levels in the normal range.
Of course In an emergency situation, anything to bring you up is always the best treatment.
Sometimes a differently at a situation can be worth a try especially if you have symptoms from a rebound effect.
Best wishes.
Edited by a mod for clarity as the OP has diabetes not RH