[prodigy06]

I got what feels like a pulled hamstring but I didn't get it from lifting. I got it from a cramp I got in my leg about 3-4 hours after deadlifting on friday night. I woke up in the middle of the night to take a piss and as soon as I stood up and took a couple steps my entire right quad and hamstring cramped up so bad I couldn't even move. It was probably the most pain I had been in in a while. After the pain subsided (like 5-10 mins) I went back to bed and the next mourning and all day yesterday and today my hamstring feels like I pulled it and I'm limping.
How should I treat this? Think it would be ok to train my upper body? Does this sound serious?