Something wrong with my eye...!!!! Help!!

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Yesterday morning when I woke up, I tried to open my eyes (obviously) but when I tried to open my left one, it felt sort of stuck. I couldn't open it all the way, only about half way and not for more than a second or two. It really hurts a lot. At the time, I didn't think too much of it, I thought I must have just slept weird or slept on something! As the day went on, it started hurting even more. Everytime I blinked it hurts so much and still does. The pain starts at about the left side of my nose and goes all undernearth my eye. Later that night, the pain got higher and went underneath my left eye, as it had before, but the pain spread to go up around the outside of my left eye as well as underneath it..The weird thing is, you can't notice it at all. It doesn't look any different than normal, you can't tell anything is wrong. Although, when I woke up this morning, it looked a little more puffy then it had..I was hoping it would just go away but it doesn't seem to be.. Does anybody know what this may be and if so, is it serious, how do I get rid of it or maybe if you know how it was caused! Thank you muchly in advance, I'm really starting to get worried and I hope it's nothing serious!!!