Prilosec and big anxiety and panics?

I'm taking prilosec but before I took nexium and had big heart skippings, anxiety, stomach pains, cant to sleep, tired,weight lose.And as I mentioned I m on Prilosec now and I feel anxiuos again.I have GERD and I dont know what to do.I got Lexapro for anxiety but not taking because in leaflet says dont take Lexapro ir you taking Prilosec (omeprazole) is there is better medicine with less side efects for GERD?I'm out of control...