the last week everytime I need to poop, and I strain,push or even get a strong sensation, I have been getting a serve headace. it starts in the back of head and where my neck goes together, it then pounds up to my forhead and eyes. and it takes me a while too recoop after it happens. alsp for the first time I was out and I was carring something while walking, exerated my self and I started to get the same feeling. should I be concerned?