Has your doc seen your tongue? What did the doc say about it?
A white tongue and an overall "not good" feeling is very vague, and you have tested negative for stds. You might have something else, and you need to find that out, or you just have anxiety.
Its not an std.
Aj
honestly bro---ur just really nervous----this nervous state causes one to freak out and experience things or symptoms that arent there..... well have u had oral sex that u are freakin out about?....if everything is fine just relax---the coated tongue will follow right after....