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I just recently switched to a PC at work 🙁. Is there any way to use iMessage on a PC?

Nope, like many other Apple apps, this is only for OS X. I use both a Mac and a PC, and I'd love to see this come over to windows, but I'm under no illusion - it will never be there.
 
Probably more chance of waking up on the moon tomorrow morning. Apple rarely share their services with competing platforms.
 
I'll just throw in that there's a jailbreak tweak (Remote Messages) that accesses your iPhone's Messages app via a PC or Mac web browser as long as they're on the same local network. You can do iMessage and SMS that way.
 
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