I Was At The Balcony Outside My Roomates Room Smoking.I

i was at the balcony outside my roomates room smoking.I chain smoke a lot but im still very new.Only started smoking on early February.After a few minutes of smoking i started to feel anxiety and it built up really quick.As soon as i start to get inside to lock the grill,my vision starts to black out and started losing control of my balance and fell down.But i got up instantly and went straight to my room as my eyes were feeling blacked out and quicky laid on top of my bed.I have no idea it that happened.Please respond.Thank you :)