I had a really intense workout two days ago and since then ive had gi issues with diarrhea and feeling sick. ive also been waking up with a slight pressure headache. on top of muscle soreness (normal). what could this be? do i need a dr?

I would be concerned if you were experiencing cardiovascular issues. The GI symptoms are nondiagnostic at this time & could be from a viral intestinal tract infection or mild food poisoning. Both should resolve with resting,drinking lots of fluids, eating a soft bland diet , & taking Tylenol,kaopectate or Imodium as needed.. Protracted diarrhea would warrant a stool culture to check for pathogens.