Hi
@Giil, it is true that your body gets used to a BS range. This is why people losing hypo awareness are sometimes advised to run their BS a little higher for a few weeks. From experience, I can confirm this helps. However, I think the advice is to change the target BS from 5 to 6.
You do not mention your BS at the time of the hypo. I know how it is: sometimes it feels so bad that you can't wait to get some sugars in you. However, occasionally, the sweaty, shaky feelings are caused by something else.
I do not know anything about ischaemic colitis (and don't want to become a "Google Doctor") so not sure what hypo treatments are not suitable. However, in general, the best treatments are something that are very fast to get sugar into your blood stream: something sweet (without artificial sweeteners), something easy to digest and something non-fatty (for example, the butter in biscuits or fat in chocolates make them bad hypo treatments). I use dextrose or Glucotabs. Others use sugary drinks but be aware, with the upcoming sugar tax, some manufacturers are replacing sugar with artificial sweeteners in their drinks.