I've had loose stools for 4 days straight no vomiting but also had stomach cramps back an head aches?

Virus: This sounds like a viral infection with the stomach issues, muscle aches and headaches. Stay hydrated and rest. It should go over within one week.

Here are some...: Your grouped symptoms suggested you may get viral gastrointestinal infection or foods indigestion. For 4-day straight loose, especially with poor appetite (if any), you pay attention to possible dehydration. So, seek timely evaluation, treatment, counseling, & watching... How to sort all these related things out correctly has not to be that hard by working together with the doctor. Best wishes...