I am a 22 year-old white male, who doesn't have immediate access to a clinic.

Two days ago, I started feeling really cold, weak, and it felt like I had a fever (my skin was really hot, etc.) The next day, I felt a lot better, but I was still dizzy and got a headache, basically only when I stood up. During the latter half of that day, I started feeling a slight pressure in my left chest, where my heart is. Now today, the pressure is still there and I still get a little dizzy and a little headache when I first stand up.

Is this something rest can heal?
Should I maybe eat more? Drink more?
Should I pick up some aspirin or something else?