Anxiety???

It’s been about 2 days since I’ve got huffy an it’s really creepy. I just finished my mock GCSE’s so I think it might be stressed. Today I could only eat grapes at lunch then a small portion of spaghetti with sausage  and toast but I’ve really been craving fruit juice. I also have a pain by my lower intestines but I think it’s just period pains since I only began my period last month or so. Does anyone know what’s happening???