GoFuckYourself.com - Adult Webmaster Forum - google is idiot if i update my site

hello everyone. i need an advice from you. i have one site that i am updating daily or every second day. updates are always about text lines, always similar textline with link. now, i am for some words in google at the first page, but, i was looking at the site closer last two weeks or so, and everytime i update the page, google throws me in few hours somewhere that i cannot find myself, after two or three days i am again at the first page, but after next update, its the same, for two or three days deep down in results, after few days again first page, but if i am updating the page almost daily, i am at the first page for few hours ... i am going to be really pissed off cause this is nothing more than stupid! and its about five times the last two weeks, everytime the same ... so i want to ask, can help something like "<meta name="revisit-after" content="1 month">"? thanks in advance for any reply, i think i can get much more traffic but if google will be acting like that i will better go and find some manual job ... wish you best with your sites! :thumbsup