I think i have a mucocele, it fits all the symptoms but i'm really afraid it won't get better. will it?

Danger: There's danger in self-diagnosis. Assuming you're correct it's best to be examined by an Oral Surgeon to determine if you need treatment or observation. If you're wrong, and it's something else, either benign or more serious, it's best to be properly diagnosed to determine appropriate treatment. See an Oral Surgeon.

Oral Mucocele: Though these lesions/mucocele heal after a few days, they are often found to reappear in the same spot. In any case, an oral mucocele is a harmless.