I have the same thing but when it's so serve I get a build up of saliva and I have to spit it out as I feel like I'm about to vomit I'm 17 and I tell my parents and sometimes even wake them up but they just give me a panadol and tell me I'm constipated and I need to eat more fruit and veg, I'm a dancer eating properly and exercising comes with that to keep fit for dance and is defiantly not that I haven't been to the doctors as my parents don't think it's worth it but the pain always gets worse each month