<s>[INST] Hi Im 19 5ft 9 I get pins and needles, have low blood pressure and have fainted on occasion. I feel all shaky and wobbly on the inside before I get dizzy. I also pains in my sides every two weeks and sometimes just cry and sleep and get sick with it , my appendix are gone [/INST] Thanks for your question on Chat Doctor. I can understand your concern. You're all symptoms are explained with hypotension. Hypotension causes fainting tiredness, chest pain etc. Common causes for hypotension in young age is decreased oral intake of fluids, deny Chat Doctor.  So get done ECG, 2d echo (to rule out heart diseases) and Complete blood count (to rule out infection). If all these are normal then deny </s>