Constant constipation for 2-3 months. How can I fix this?

Since late November, I've been constantly constipated. After breakfast at a restaurant with a friend, I returned home and was unable to have an easy bowel movement. I am still "regular" but when I have a bowel movement, I am positive that there is still more, yet my body won't expel what's left. My feces is very hard but I p it by pushing quite forcefully, which I think will eventually lead to an aneurysm. Before the restaurant, I was constantly regular with ideal bowel movement; the perfect texture and consistency. I have not changed any dietary habits and would like some help.