what could this be not feeling well for all most 2 months please help me?!

i have been feeling nausea for a month everything i eat makes me sick why is this and i just recently started getting bad headaches why is this please help me 22 years old need a lot of answers i always feel like i am going to pass out please need a lot of answers thanks i had sex last month 2 times and not sure what is going on with me please help i have had my period this month and last month this month period was 2/09/2011 and last month period was 1/14/2011 any help wound be great i always feel dizzy not mater what, i passed out on December 1 of 2009 due to being not having enough Liquid in me the medication that i take are morning medication is Sertaline(25 mg take one tablet every morning )other morning medication is( OMEPRAZOLE 20 mg take one tablet 30 to 60 minutes before eating ) night time medication is SEROQUEL 50 MG take one tablet by mouth nightly at bed time ) ( currently i saw my doctor in january and she told me to start taking 50mg to 100 mg of Seroquel at night hope this helps i have been on the seroqul and sertrline since 2008 and the other medication since last year hope this helps, i love Sugar and salt by it self what could be wrong with me i have been drinking Lot lot lot of sugary drinks do you think i could have diabetes i love sugary food to i all so pee a lot to