Scared of taking new medication

Hi, not been on here for a very long time. I have been diagnosed with anxiety due having panic attacks etc. 3 weeks ago I was prescribed Sertraline 50mg. I took one tablet and within 2 hours I was in bad shape. Fever, diarreha, cold, restless, heart racing to name a few. I phoned the GP who told me to stop taking them. I have now been prescribed Duloxetine 20mg once daily. I have had them for 2 days but have not taken any due to the experience with the Sertraline I was convinced I had Serotonin Syndrome which is probably not likely. My GP said I was one of the rare cases in which this happens. Any thoughts about me taking Duloxetine. Many Thanks.