I have lower abdominal cramping and sometimes it feels like my stomach is burning. i have waves of weakness that go across my body, heart rate is slightly faster than normal and have a deep headache

Doctor can examine: Abdominal pain can be from many things. Stomach acid problems cause pain, as does pancreatitis or gallstones. Appendicitis is always a concern (pain is usually right lower abdomen, worsens over time, with fever coming on). If constipated for a while, stool backing up can cause pain. Flu-like illnesses and abdominal infections can cause pain, nausea, vomiting, diarrhea, fever. Doctor can evaluate.