if we wish to be a nation of laws rather than a tyranny, then we most certainly should have a declaration of war from congress before going to war.
even dropping one little bomb
You are talking nonsense. Obviously you have no understanding of the declarations that have been approved to date. Aside from your complete lack of understanding of the historical conditions and Congressional approvals leading up to this action you are wrong in principle as well. No president is limited from protecting the nation. The fact that we have had a president for 8 years who refused to act responsibly is not a viable precedent for the current president.