Hi I came back from USA there I was using ambien...

Dear Customer
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can you buy ambien without prescribtion ?

No , ambien isnt an OTC medication, and you have to go through medical means to get it inclduing consulting a doctor and do the needed medical examnation 

what are the medication to help treating insomnia :

1. Benadryl ( Diphenhydramine )
2. Unisom ( doxylamine )

general advices :

1. please consult your doctor for your anxeity medication 
2. dont use any medication without doctor prescribtion 
3. recommanded medication for insomnia is originally anti-allergy medications , and sleepness is a side effect and for that is used for treating insomnia as a OTC  medication
-( OTC : over the counter - no need for prescribtion ) 
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Kind Regards