Hi, I Have Been Seeing Green Blueish And Pinkish Tints

hi, i have been seeing green blueish and pinkish tints in my bright vision and not being able to process most things around or what i am staring at and ringing in my ears and the feeling of blacking out and also blacking out for two months now. when i get up, i kneel and sometimes when i stretch to adjust my posture. i am use to standing up too fast and blacking but recovering in a few seconds but this goes on a while and i feel disoriented but lucid a bit my thought are dampened though. what could this be? I have not been eating well over the last few years. but my blood results come back with normal levels. i have been to the doctor and i had xrays of my chest to figure out i had broncidus a month ago. it went away well. i skip eating alot due to financial issues and a nicotine habit or addiction. and i have been smoking for 3 years. i have really cut down. i use to buy a pack a day. i do not smoke as frequent. some days i decide to not smoke at all. i also have kyphosis and scoliosis. i work on posture painfully on a daily bases. i am 21 but i dont have a lot of muscle or facial hair. i am skinny. i have acne. i have pectus excavatum. i take no medications. i have received some physical therapy during a part of fall and winter. butmy posture and pain seems to worsen.