What Do Dizziness, Sore Back, Increased Appetite With Gas While On Birth Control Mean?

finished my period about two weeks ago i am on birth control but sometimes miss it and most of the time take it at different times a day. i also smoke cigarettes and drink occasionally. but a few days now i have been feeling light headed dizzy and sore in my lower back area. i am also having headaches and am eating more than i normally do at this time in my cycle and i still feel hungry after i eat. i am also gassy and drinking a lot more water because im so thirsty! and i have a lot more acne than i normally do and i am sweating more