Hi, in my opinion Bupropion is not a gud choice considering its negative impact on anxiety state. It is a gud choice for Depressive symptoms but not in backdrop of primary anxiety disorder. Few may beg to differ on this based on their clinical experience. But theoreticallly and scientificically it's use at this point in ur illness (if diagnosed correctly) is not apt.
Next Steps
I Wud suggest either increasing the dose of escitalopram and wait for 10 -12 days or using venlafaxine after cross titration with escitalopram (provided u r able to tolerate either of these)
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Hope this helps... Take care