Daria, I know what you mean about switching drugs! I live in fear of the day when one or both of mine quit working and I have to go back on the merry-go-round of trying new ones. And lexapro is really good for anxiety. It's not unusual to add bupropion on top of a regular SSRI. But a PCP might not do it. I HIGHLY recommend going to the best psychiatrist or psychiatric nurse you can find. And regular therapy, too. (Therapists can refer you to a medication person.)
I have only been on the wagon, so to speak, since the 9th. It was dumb of me to drink while on medications, and now I'm paying the price with anxiety and depression creeping back. But who knows, I probably would have felt that anyway!