to start with, read these guides if you haven't already and then come and ask about anything you are a little unsure about.
http://www.diabetes.co.uk/high-low-blood-sugar-symptoms.html
http://www.diabetes.co.uk/Diabetes-and-Hypoglycaemia.html
http://www.diabetes.co.uk/what-is-a-hypo.html
Here is a list of some of the commonest symptoms.
Feeling dizzy
Feeling hungry
A change in mood
Feeling sweaty
Trembling
Finding it hard to concentrate
being pale
feeling weak
a higher heart rate than usual
blurred vision
temporary loss of consciousness
confusion
convulsions
and even coma (in serious cases)
Bear in mind that the list of symptoms of an hypo is not an hard or fast rule, and its not always the same for someone who is having one - he could tremble and sweat one hypo, and just be confused and weak the next.
And of course circumstances can mimic some of the symptoms. Checking your blood sugar levels every time you got one little symptom that could be an hypo would be infuriating to do, so those of us on insulin or other medications that make us prone to them try to judge by the way their body has been feeling, what is happening at the time and experience.
If you see him sweat or tremble when the temperature doesn't seem to justify it; he seems a little confused or cannot concentrate or his mood changes when the situation isn't likely to cause it, or something else slightly out of the ordinary' then you could always gently ask if he is OK, as at the early stages sometimes the person may not notice. If he says he is, and he thinks its not an hypo, then just keep an eye out for other symptoms just in case, but defer to his judgement at first.
Just familiarise yourself with the symptoms, and ask if it seems appropriate. Bear in mind that he may not want to worry you or be pestered with questions about hypos, so if has symptoms he might spot them and discreetly treat them without telling you.
If his blood sugars are below 3.5 mmol he is definitely having an hypo, and should be treated accordingly. A lot of people start getting symptoms before that, I always have a little something to eat even if its borderline in case is going down.
Treatment- Its recommended to have around 10- 15g of carbohydrates after an hypo. The more of it is sugar the better for an hypo, so some foods are better than others. Some sports brand foods will have a lot of slower acting carbohydrates, so stick to foods that are mostly fast acting sugars and use the others for after the hypo.
Liquid works faster but can be less convenient to carry around than tablets or other sweets If its lucozade its about 50-100ml, soft sweets like jelly babies or fruit pastilles 2-3. Glucose tablets it depends on the make - the square Dextro Energy tablets you often find in the shops can be up to 5 to get a full 15g dose, Glucotabs 3-4. Glucogel or other glucose gels will depend on the make, but its often one tube if its a sealed one. The advantage of the latter is that it can be used if the patient is still awake, but unable to swallow , as it can be massaged into the gums or the inside of the cheek. Lastly there is a glucagons kits which will need training and I do not know the best way to get hold of one, you might have to see what others say.
Other good things for an hypo - fruit juice, cola, lemonade, sugar.
After treatment its a good idea to eat a light snack to keep blood sugars up until your next meal - a slice of toast, snack bar, or anything else with some longer acting carbohydrates. He doesn't bother if the next meal is within an hour though.
It's sometimes a good idea to test again 10 to 30 minutes later. If I were uncertain that my insulin levels were correct, the hypo came when previously high BG's, had more exercise than normal. or had been having hypo's without symptoms I would make sure the treatment was working, as in the past one dose hasn't been enough.