For the past 2 days I've been very weak and my limbs feel really heavy. I've been resting and got a decent amount of sleep last night but I've woke up feeling worse than before, like I haven't slept all night and I've ran 20 miles but now it's accompanied with the worst stomach pain, it feels as though I'm having contractions it's that bad. I'm not usually a person who gets ill and I've got so many things to do that it's the worst time that this could happen.
Has anyone had this before and could pinpoint what it could be? I'm worried about how rough I feel.