Ok, here are a few obvious facts
1) You have a CALYPTRATUS. Calyptratus eat HUMAN FOOD like vegetables and fresh fruits! You can easily find a few in your fridge to give him! If he doesn't eat any, it's because he isn't starving that much, don't you think so?
2) Since your brother lost YOUR key, he owes you a service. That service could easily be guarding the house for you while you getting some crickets on your bike, no??
3) As someone stated, chameleons can survive much longer than 2-3 days without food, so a few days isn't very bad. Of course, it is not the best, but just think about it when they are in the nature: do you really think they eat everyday?? I don't think so.
4) As someone else stated, there is something to learn from your different episodes (running out of food, brother lost your key, mother not helping, you not surfing the web to find answers by yourself, etc). There's plenty of stuff for you to think about for quite a while! Your job is now to NOT repeat the same mistakes!
5) As Ryan said, you were making excuses. Excuses can sometimes be good reasons, but when they massively used (like here), that means something! Your job is now to find what it means!
Don't ask me what it means, i don't know you enough to tell you and i don't think you can afford my services!
Don't get me wrong here, my goal is not to bash you. When i was your age (and even now), i did and still do tons of mistakes, and some were way worse than what you did today. However, i tried to learn from them, and now, i am trying to give you a few tips on what to work to make sure you will not repeat the same mistakes.
Good luck!
