Near my left hip bone I feel something like bubble, it is painful

A couple months ago, I noticed near my left hip bone I have been feeling weird. I don't really know how to explain it other than saying, it feels like a bubble and when I moved certain ways it felt like it would rub against my hip bone. Well just the other day I noticed when I touched it, it hurts. And also, it feels like a big ball or something. It's only on the left side. But sometimes it hurts when I'm having sex. I always feel bloated but I have been losing weight too. And ever since last night, I get a pain there, and it moves across (where I would normally cramp when on period) and to the right hip bone. I have had problems with bowel movements for a few years now, but I have noticed since I had my miscarriage over 2 years ago, my periods have been out of whack and all messed up. Idk if it could be a cyst, emdometrosis, or something to do with my intestines. I have looked it up and those are the only things coming up that it could be. Can somebody please give me an idea of what it may be?? I'm so scared!!