Hello Khione: No, I have no idea... really... my perspective is this is something you need to see a medical doctor about. This could be the beginning of some sort of chronic illness, or it could be merely a result of stress... both physical & / or emotional. The possibilities are so many that it's really impossible for any of us, here on PC, to give you any kind of useful insight into what's going on.
For that matter, even if this does eventually turn out to be some type of illness, it's possible even a medical doctor may not be able to define it at this early stage. Sometimes it takes time for these sorts of things to develop to a point where they can be accurately diagnosed. However, the sooner you begin to delve into it, the sooner you will hopefully know what's going on. At least you'll have the satisfaction of knowing you've done what you can do to address it. And, also, there may be some treatments available that will help to minimize whatever discomfort you're experiencing at the present time. My best wishes to you...