Achilles tendon problem? Please help ASAP if you can! Thank you!?

Hi, I think that I did something to my achilles tendon, as it's been hurting significantly for over a week now. It's very painful RIGHT where the achilles tendon is (I've looked at diagrams so I know exactly where it is). It hurts when I move my foot in all directions, but especially when I bend my foot upwards (as if I was trying to touch the top of my toes to the front of my shin). It also hurts extremely bad if I press on the area, even lightly. I can't even walk on it, yet I have no idea what I could have done to it. I think it was running in high heels. Occasionally I get a tingly/pins and needles feeling along the bottom of my foot. Also, sometimes when I try to rotate it, maybe 4 out of 5 times a day, it makes a loud cracking/snapping noise. Does this sound like a strain, or a tear, or something of that sort? I don't want to go to the doctors and act like a baby about it if it's just a little sprain, but I'm very tolerant of pain and this is so bad that I wince when I step on it