Sharp Pain Near Belly Button - Seeking Advice

i’ve been having stomach problems for a long time now. it’s been since 7th grade to as of right now 11th grade in high school. my symptom that i get is a very sharp pain near my belly button. i cannot stand up when this happens. when i try to stand the pain intensifies. it’s a random occurring thing and i don’t know why it’s happening. it’s been happening for a while now and ive been to the doctors more times than i can even remember with it being something different every time. i am reaching out to see if anyone has/had this pain aswell. please let me know