I have body aches, back/abdominal pain and my body is really tired, but i haven't changed anything lifestyle-wise. i thought it was because my period was coming (although it hasn't yet), but i've never had symptoms like this for it. is this normal?

Nonspecific: Your symptoms are nonspecific at this time but could be part of a premenstrual syndrome caused by hormonal changes and imbalance. They could also be a forerunner of a viral infection which hasn't declared itself yet. The next day or two will tell the story. For rest up, now take acetaminophen and avoid excess salt in food or cooking.