You cant control your greed but it might be an idea to bet at lower odds you bet at to ensure that you don't have huge swings in the results. And don't raise stakes to chase loses, hold steady at a comfortable maximum stake. Set limits: It sounds like you have the potential to bet beyond your comfort zone. Its a good idea to set a daily limit at the Bookmaker to ensure you don't do anything you regret.
If you bet with lower odds, it wont really ensure that you will win. It may sounds like crazy to know that you could get alot of profit by betting like this however once you lose, you lose everything. I have tried this many times and it is not profitable, if it is profitable then most people will recommend this kind of stuff to others