Firstly order is passed by Family Court, at District Court level; any appeal or revision against the order shall lie in the High Court only.
Secondly the presiding judge has taken in account the documents placed on the file with regard to your income for previous 3 years or so and even if you are presently unemployed he considered that you are capable of earning even now that you were for previous years whether in India or abroad. The income and earning capacity of wife would also have been taken in consideration.
A revision in the High Court may serve the purpose to minimum as the High Courts usually don't interfere in the order of the subordinate court specially in the interim applications unless there is infringement of law or legal process in the order and the subordinate court has not acted within its jurisdiction to decided the issue that ought to be decided by it, in other words, causing irreparable losses and extreme injustice to the party.
In your case the High Court may reduce the quantum of monthly maintenance by few hundred/thousand rupees but will not reduce the period (i.e. from date of her application) for which you have to pay your wife.