The US sends Pakistan $500 million per year, whereas the Pakistani diaspora sends Pakistan $12 billion every year. The IMF & World Bank do not fall under the jurisdiction of the US: when Pakistan had sanctions imposed on it by the US in the 90s, Pakistan was still engaged with those two. So there goes your talk about the economic blockade.
I've already explained to you the ramifications the US will have to face if it engages in a direct confrontation with Pakistan: it will be a disaster for the US Forces in Afghanistan. Instead of getting emotional, it would be better if you resorted to facts & looked at things objectively. The US cannot open a new war front now, especially against one of the biggest & most professional Army in the world, as well as the 7th populous country in the world that won't be afraid to fight. The economy is in dire straits, the people want the troops to come home, & there is excessive pressure on the civilian government to pull out. The best option the US has is to pressurize Pakistan or act covertly, but if Pakistan does not give into US pressure, the US will be left frustrated in Afghanistan & won't be able to do anything about it.