I have heard too the sertraline is a slow starter, when my sister first started on it it took a while to kick in, she doesn't take it for anxiety tho its for an eating disorder and she was very low and poorly, she had to increase her dose to 150mg but now she's stabilised on 100mg, it's been fantastic for her a real lifesaver. The anxiety is awful isn't it? I really feel for you, I spent the first 3 weeks of my increase curled up in bed praying it would stop, the Diazepam only took the edge off but it did help XX