fluoxetine or sertraline

Hi all, I have been suffering with anxiety and fear of panic attacks and agoraphobia for the last year and a half. I decided to try and take control of my life and I was prescribed 50mg sertraline to try last week. I took one dose of the sertraline and the side effects were unbearable (extreme nausea, spaced out, kept feeling like I was going to have panic attacks for no reason) so I quit them after the 1 dose.

The doctors tried getting me to persist with 25mg instead but the whole ordeal has put me off.

I spoke to the GP today and they want me to try fluoxetine instead (20mg). I was wondering if anyone has tried this medication and what their experiences were for the first week or 2 of trying it, as I'm absolutely petrified to try another medication, but I know I can't go on living my life this way and want things to improve.

I'm just really worried about the intense increase in anxiety while I start taking any new anti anxiety meds and would rather try one with less side effects and be on the lowest dose possible.

Thanks 🙏🏻