You could start writing it down in a log, that way you can see if you have done your injection yet and what bg level was. I personally use software to download the contents of my meter, manually adding insulin dose and various comments. Maybe being more methodical will help you and make yourself accountable for your bg level. Testing even if you have forgotten to take your dose and know you will be high, at least you will see the cause and consequence of what you eat and do.

Good luck