Strained too hard pooping. left side headache, face warm. excruciating neck pain and stiffness. left arm squeezing pain. sometimes cramping. left leg pain. sometimes chest hurts and shortness of breath?

If you have had these symptoms for a while, it's time to see a doctor. If these symptoms are acutely occurring (only one time) after a difficult bowel movement, you need to take care the constipation first by increased exercise & fluid intake, eating high fiber foods or taking stool softener +/- laxative (miralax, milk of magnesia) and observe other symptoms. See doctor if symptoms persist.