I'm fed up with coughin day and night plus i'm asthmatic?

Been coughin day and night for nearly 3 weeks now, progressin gettin worst. I'm asthmatic using steriod inhaler 2 times a day. Been using blue one 2 to 3 times a daY recently. Any tips? Is it swine flu? As not had a fever, runnin nose, achey or anything like that. Back hurts from coughin. Bringing up white and clear mucus. Like 2 have a full nite sleep. Hope u can help? X