Insulin not being absorbed

Messages
2
Type of diabetes
Type 1
Treatment type
Insulin
I've had diabetes for 30 + years so my insulin is not being absorbed, yes I rotate my sites, ideas?
 
Messages
2
Type of diabetes
Type 1
Treatment type
Insulin
How do you know this is the case? What do you mean?

By blood readings, before the meal I've taken a reading and it's say 6.6, then I've taken my usual injection 24 units for my evening meal, having calculated the carbs, 2 hrs later it's zoomed up to 17, then crashes down to 2.7 during the night.