Need some medical advice

Patient : UP until april i got my periods normally it was the 21 of every month then april it came the 15 till june then july i missed it and it came the 4of august then i missed it in september now its october 2 and its here i took several pregnancy tests negative ive been having nausea i feel a constant pressure in my stomach and fatigue every day along with headaches Im at the point where i am exhausted and i cant sleep well anymore its taking a toll and i dont know what to do.im 18 years old what could this possibly be ?
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