Uncontrollable blood pressure readings

The doctor has recently changed my husband's medication.  He had been on nifedipine 60mg and lisinopril 49mg for yrs and was having excellent readings mid 120's over high 70's to low 80's. My husband wanted to reduce his meds so the doctor discontinued the lisinopril and increased the nifedipine to 90mg - reaction his foot, leg and ankle swelled and he was in so much pain. He was then put on clonidine and his blood pressure skyrocked to over 185/110 and rising and he went to the va emergency rm and they put him back on nifedipine 60mg the pressure was in the 150's over 90's however  the swelling would not go down.  He is now on valsartan 160mg and his readings are staying in the high 160's 170's + over 100 +.   Could there possibly be some sort of blockage preventing the medication from doing its job or should they add a diuretic   vlasartan hct?   He has been on valsartan for about 17days and the leg swelling has gone done alot.