<s>[INST] i came in from my work which was night shift, i had some toast and tea and went to go to bed and i had a tight chest and felt i needed my inhaler, i got back upstairs and collapsed on the bathroom floor and blacked out for over 2 mins and then came round and felt sweaty and cold. [/INST] Fainting or syncope can be due to number of reasons. It can be due to low glucose, sudden drop in blood pressure or due to abnormal heart rhythm. If you are feeling chest tightness or palpitation(racing of your heart) then see a cardiologist. </s>