21y was hospitalised for appendicitis/but negative. Low BP, vitamin d deficiency, fatigue, light headed, dizzy, abdominal pain, nausea after eating?

Multiple symptoms. Did all these symptoms begin after discharge from hospital? How low is your blood pressure?
Please make a follow up appointment with your physician as soon as possible or go to urgent care for evaluation.
See dr. A 21yo, particularly female with abdominal pain and dizziness and low BP could have a variety of causes - some serious - if not appendix could be pelvic or kidney infection (pyelonephritis) among others. May be something else such as a bowel motility disorder or even celiac disease given the low vitamin D. Needs urgent medical assessment to r/v what already done as may need further tests.