these last few weeks i have felt mi limbs tired/weak, its like they are tense or something, like the pain after an intense workout i guess. i just feel like that in the morning at school (i dont even want to get up my seat), but it goes away throughout the day. these 'pains' however, started when i began to sleep less because of homework and exams (i used to sleep 2-3 hours, and then another 2 hours after school), but now that i'm free i'm going to fix my sleeping hours and then maybe i wont feel so weak.
are you getting enough sleep? maybe it could be that youre not sleeping enough or that youre sleeping too much?