Left side of iPhone4 screen not working?

Today, the screen on my iPhone randomly stopped working just on the left side. I can't access any of the apps on the far left column. Using my phone to text has become especially tedious… Anyway, I can't figure out what happened to the phone for the life of me. When I woke up this morning, the whole screen worked fine. An hour later, it had stopped working. I didn't drop it or get it wet or really do anything to it in that time span. So far, I've tried resetting it, turning it off and on again, and completely restoring it. Nothing worked. I really don't want to have to replace my phone. Any suggestions as to what I should do next?

Check blood pressure, may be left side paralysed.

What would cause the left side of Screen not to respond to touch anymore. It has never been dropped, or got wet? I have reset all original settings, shut it down and restarted it, etc!

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