the hive may present suddenly and may take a chronic course .
better will be to consult dermatologist
and get a check up and tests done and taking the right medicines to control the condition .medicines will vary depending on the response to treatment
multi drug treatment may be required some times .
as for you you may change the medicine . allagra 180 may be taken 2 to 3 times even to control intense itching.
in uncontrolled condition eticort tab may be taken .
best will be to get a check up and take treatment as per advice
hope you be all right soon