Stressed beyond words without knowing what im stressed about?

ive been insanely stressed lately and i was completely fine until my mom started constantly yelling at me over my grades. ever since she started ive had jumpy reflexes, trouble sleeping (melatonin didnt work), i get aggitated much more easily and go on rages without control, ive lost my appetite, my upper abdomen has been in intense pain, im feeling lost and anxious and idk wat to do. plz dont post n e nasty or rude answers, if i wanted to hear people criticize and belittle me i would ask my teachers a question and listen to them yell at me (no thats not a exaggeration so do NOT say it is)