Suggest Treatment For Pain In Knee Joints And Generalised Weakness

i had tripple vessel heart disease,undergone bypass surgery in dec 2007 and my eF is 30%.i am diabetic type ii and currently on haman insulin 30/70.i am also suffering from liver cirrosis and GERD.thing are complicated as one doctor advised belalalgis and metformin.other advised insulin .i have an experience that the medicine do interfere with each other.i take telsar beta 50,ecosprin gold 20 and dyter10(presently half) for heart,insulin 20 units at night,half tablet of euglim m2 for diabebtese,ursocol 450 for liver.my sugar level fasting was 111 and post 137.i feel weak and my knee joints are paining for the last one week .i am confused and donot know what to do.please advise.