Hi, a couple of days ago i ate a subway and halfway through it i suddenly felt really bloated, as if i couldn t even have another bite. My friend said looked very ill, so i put the rest in the bin and walked out. As i was walking i started to feel as if i was going to pass out. I started stumbling then i sat down for 5 and when i got back up i felt fine. This has happened to me once before after i bought some bbq wings from chicken cottage. I eat a lot of chocolate during school. Im 15 and smoke cannabis quite often. Is it my diet? Are these symptoms of anything serious? Also, my heart sometimes beats very fast, like 3-4 times a second. Should i get checked out?