Lower abdominal pain can come from
gas pockets, twisted bowel, constipation, endometriosis (if female), ulcerative colitis, appendicitis (if low right with rebound tenderness), and more.
Chestpain and strange sensation in shoulder to fingertips (if left sided)- you should make sure your heart is okay with a doctor. I've heard often females (if you are one) can experience a heart attack like heartburn.