Yikes I’m a (nervous) wreck just after switching from Prozac to lexapro

Need some support. After waking up all crying and low on Saturday I talked to the doc and we agreed the Prozac (20 mg) wasn’t working. He switched me to lexapro 10 mg. It’s the second day and I’m in a constant state of panic! He gave me hydroxyzine but today it’s not doing enough and I’m worried I can’t take it anymore. It’s probably my anxiety that is scaring me, but it is scaring me.

Is dose too high?

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Can it be a mild serotonin syndrome? Prozac is still in body, lexapro on top of that and hydroxyzine has effect on serotonin as well