Same thing happened to me when i took lexapro and I also took half a dose. The nausea and dizziness were unreal. The weird anxiety/ sleepiness combination, too. Sometimes SSRI ( like Paxil) cause these precise side effects at the beginning of treatment. When will you feel better? Check the half life of Paxil. Just for example, the half life of lexapro is 32 hours and it took me 3 days to go back to normal after a single dose.
Of course, I'm not a health professional, just a fellow anxiety sufferer. By all means, call your dr and tell him how you feel.
In case you do decide to continue the paxil, most people say the side effects subside within a week or two. However, each case is unique, so please, call your dr.
Good luck and keep us posted.
Tina
Sometimes people have bad reactions to medication. Sounds like you did. I'd say it would take a day or to to get out of your system to feel normal again. BUT I'd call the DR to let him know what it did to you.