flip flop his position so many times that now i can't trust any thing he says as a Medical professional,am i wrong ?
Yes, you're wrong. The people you shouldn't trust are those who start from one position, and then stick to it relentlessly, even when evidence piles up to confirm that their position is incorrect.
Fauci has stated that he did not change his position on topics because he had additional information. He has stated he changed positions because he had previously known his position was incorrect at the time, but publically said things contrary to his beliefs for reasons relation to social control.