Troubles with my cat.... being aggressive...

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Well, my cat is almost two years old now. I have been through a lot of stages with him. He seemed to scratch and bite a lot but I spent a lot of time playing with him and teaching him when he got too rough. I thought he was getting better. I was patient with baby-step progress. He seems to be a nice cat as he's always purring and hanging out with me. However, lately he seems to be a little more aggressive than usual. He will be sitting on my lap and as of right now I am doing a ton of applications for jobs so I really can't have him pawing at my screen. I am in the process of graduating from college this week and trying to find a new job. It's very stressful for me, and I don't know if he's noticing the stress level in me. The past week he has clawed me really bad but it wasn't just him swiping his paw at me. If he's on my lap and everything is just fine I'm petting him, suddenly he flips out does a loud yowl and basically viciously attacks my hand. Twice in two days he's attacked hard enough to make me bleed. He doesn't seem to "dislike" me and that's why he's doing it. He sleeps next to me or at the foot of my bed every night, and follows me from room to room like a puppy. He purrs all the time and greets me at the door when I come home. I am not understand why he's doing this to me. I thought he was getting better about his biting and scratching but all of a sudden it was like he took a huge leap backwards.