Are these sentences ok?
I have such a worry.
I have such a concern.
I don't have any concern like that.
I don't have such a concern like that.

Question

Answer

Correction: I have a  bit of concern about............../I am a bit anxious about...
I have  a concern about................./ I am anxious about........
I don't have any concerns/worries like that.
I don't have a concern like that.

Answer

No, they aren't.

I have an anxiety.