Recent knee replacement surgery (7 days ago)

I have been taking 80 mg Kadian twice a day, and 30 mg. oxycodone 4 x day for breakthrough.  Also Fioricet for severe migraines.  I had "knee replacement surgery" less than a week ago.  My pain management Dr. gave me "MSIR" 30 mg to take when I got home from the hospital.  It hasn't helped much with the "pain from the surgery".  While in hospital (post surgery), they kept a "block" in, and used morphine pump 1 mg, every 8 min., and "demoral shots 50 mg" to get me over pain.  Now home 2 days, and "MSIR 30 mg" twice a day , and it isn't helping very much.  Any suggestions?