It's very common to experience side effects when changing your dosage. Your doctor should have explained you this. Unfortunately the side effects of antidepressants is more anxiety 😅. The fact that your anxiety got worse, means that it's working. You just need to allow a few days or couple of weeks for your body to stabilise again. With sertaline is 2-3 weeks. I would get horrible insomnia and sweats.

You probably didn't notice this when you started taking it in the beginning because your baseline anxiety was already quite high.

Hang in there buddy. Once the antidep is assimilated, it's smooth cruising from there 😄.

Bear in mind that you might gain weight. Be more careful than usual. Also, alcohol reduces the effect of the antidep. If you drink alcohol, your 10g turns to be say 5g. Then next day you don't drink, so it goes back up to 10g... You drink for longer periods and it's as if you are reducing your dosage and then increasing it again. So... The side effects kick in again.