100% Blocked, Stent To Open, Went Into Tachycardia, AFib, Treated With Drug Therapy, Still Has Shortness Of Breath. Why ?

My husband had 100% blocked and stent to open on 19th. His heart rate went into tachycardia and Aflib ... and they started treating with drug therapy in hospital... was there 5 days while they worked to keep a sinus rhythm. His heart rate many times in 150's 160's. They also had difficulty with blood pressure going low... sometimes 70's over 40's. Stabilized the heart for about 18 hours and released him. Then home he began having shortness of breath after 10 to 12 hours... it became more severe and I took him back to the hospital within 40 hours after his release. Medical personnel said he was having Congestive Heart Failure. Today is the 6th day after his re-admission. They cannot keep his heart in Sinus rhythm... they are changing doses and types of medication to regulate the rhythm. Nothing seems to work over 12 to 16 hours and he goes back into fibrillations and tachycardia. Is this usual? Should I look for another group of heart specialists? How long should they be trying drugs to regulate before considering open heart surgery or electronic intervention and treatment? I am suspicious. The Hospital has a new open heart surgery facility opening within days and I am thinking they are prolonging his treatment until they open the unit.... Making me suspicious and untrusting of the treatment he is receiving.