I admire your enthusiasm, try not to lose that quality and you could get far in life.

Here are a few advice I have, take them for what they're worth:
- Choose your battles wisely. The bigger the company, the more chances there is to have someone with more power than you that will be intimidated by your results. The actions they take can be surprising.
- Be certain to always take care of your primary responsibilities first before taking others.
- Only get involved in other responsibilities if you can have a reasonable impact without burning yourself out.
- When getting involved in other projects, like in your example, make sure your help is welcomed. And when it isn't, try to free yourself mentally of the success or failure of the project.
- In situations such as the example you wrote, try not to take the credit for the solution yourself, try to make it look like the solution came from them and give them the opportunity to give you credit if they wish. It will have a better value and a bigger impact coming from your colleagues.