What can cause chest pain that’s come and gone for months?

Since around maybe September or October last year, I started having chest pain or pain somewhere below my chest. A few months before that during the summer, I felt a feeling of fullness right under my chest. The chest pain would come and go, but it’s still been coming and going four months later. Sometimes the pain radiates to my back, or it feels like the pain is in the same place on my front side as my back side, almost like if there was a line going through me, it’d connect the pain on my frontside and back. It seems like there’s days when I feel the pain and eventually I kind of get my mind of it, but when I feel the pain it worries me and I feel like something is really wrong.

Maybe around noon or so today, I felt the pain in my chest. Maybe half hour or an hour after feeling the pain, I started feeling a fullness right under my chest or kind of near my ribs. At times it’s felt like there’s pain or pressure near my sternum. I’ve also been constipated and I wonder if that has anything to do with this.

Do I need to go to the hospital for this though or go somewhere urgently? I’m feeling somewhat better now, but it scared me having the chest pain. This has happened before in the past and eventually has gotten better, but it hasn’t completely gone away. I have a doctors appointment this Thursday, but I don’t know if I need to do something sooner.