"Normal" non-diabetic blood glucose readings should fall within the following ranges:
Fasting/before meals 3.5 - 5.5 mmol/l
2 hours after meal less than 8 mmol/l
I assume from both your question and your profile that you have not been diagnosed as diabetic. Have you been to see your GP about these hypo episodes? I think the doctor should be your first port of call - explain exactly what you've said in your post and see what he/she says.
A hypo can be treated quite easily if you catch it in time. Always carry glucose tablets with you as well as your meter. If you feel strange, check your BGs. If they are too low for your liking - mid 4s or less - chew a couple of glucose tabs. Test again after 15 minutes. You are aiming to reach the low 5s, for your own comfort. If you're not there, chew another tab.
Glucose tablets are available from most pharmacies and some sweet shops.
Do, please, see your GP as soon as you can. You need to know for certain whether or not it's diabetes.
Good luck!
Viv 8)
We are all a little different when it comes to hypos. I'm okay at around 3.5, you apparently are not.