Constant Abdominal Pain for 2 Weeks

I'm a 25 year old female. I've been experiencing constant abdominal pain (upper and lower), lower back pain, headache, nausea, body aches, dizziness, fatigue, and mild heartburn for almost two weeks. I feel hungry literally at all times, but eating doesn't result in any change. My bowel movements are normal. I've tried antacids with no noticeable change. It's been gradually getting worse. At this point, I'm spending most of the day and night doubled over in pain. The pain is burning, cramping, and throbbing. It wakes me up at night. On a scale of 1-10, the pain ranges from 7 to 9 at any given time. Today I've also been experiencing a stabbing pain in my lower abdomen on the right side. What could be causing this? Is it anything to worry about? I'm not on any medications, I'm not sexually active, and don't have any known allergies. No major medical history, had a c-section about a year ago, and I have an IUD.