Depends on what you consider healthy, since healthy could be different for most people. Plus there is so much bullshit regarding nutrition it's difficult to know who to trust. If there were one magic diet, then why would there be a new diet coming out every single year? This obviously means that no one knows for sure what is healthy, or else such a diet would exist. Because of this, I use nothing but personal experimentation to figure out what feels best for me. Though since you say you have problems with high blood pressure, such experimentation could prove risky...
Anyways... healthy food is damn expensive, that's for sure. If you have nothing against canned foods, you could try that. Potatoes, eggs, and rice are also dirt cheap. I don't know how you could afford enough healthy food to keep you alive with a meager 10$ a day xD Unless my grocery stores are just that much more expensive.
And also fast food isn't that bad for you... "Supersize Me" was a bullshit movie anyways. EDIT: Okay looking over the McDonald's menu, you'd be better off not eating fast food but only because the sodium levels would definitely not help your health in any way, so forget my last comment. I personally won't stop eating it >.>