day 5,not feeling so good

hello all. im new to the site, iv been following for the past few days tho. im on day 5, although i didnt start with just water, im mostly on just water now. i also drink green tea, oolong tea, take my Antibiotics for my current bronchitis, birth control pills, and.. omega 3 and CLA capsules. oh, and i drink the occassional diet soda, zero cals. and... i know i know, i still smoke. yikes. i guess im doing this more for weight loss the detox. im not hungry, at all. but i do feel nausious and kinda dizzy/faint. i went tanning yesterday, and i swear i felt like i was going to pass out afterwards. is this normal? or is this due to the sodas? pills? tea?
thanks in advance for any help.
oh, and im 22, female, 5'7.5,
SW: 147
CW: 142
planning on fasting for 30 days.