Wow, 4 hypos a day, that sucks a**e.
You need to eat! And do less insulin! I think just about covers it...
Are they always at the same times? Is there a pattern? I used to always get hypos at about 10.30, after getting up at 7 and rushing around taking kids to school, getting myself to work..by mid morning I would crash.
Finally the penny dropped and I had one extra weetabix and a couple of less units of insulin, and I was fine.
Maybe carry something in your pockets that you can snack on, muesli bar or something?
Set your phone alarm for regular intervals, test and eat/and or inject.
Good luck!