Why no euphoria?

[Daytona71]

SWIM has had several back surgeries and has a pump implanted that delivers about 1mg. of morphine sulphate per hour intrathecally(directly to the spinal canal/brain). To supplement this SWIM also has 60mgs. of Methadone available daily though he tries to stay around 40mgs. Then he adds about 48mgs-64mgs. of Dilaudid to this depending on the pain. SWIM also has prescribed 40mgs. of Valium per day. A 12.5 mg. tab of Ambien CR at bedtime. Since SWIM has nodded at the wheel he has 40mgs. of Dextroamphetamine daily. This is the area he has a question about. he said that back when he was young around '71 he had 1 (ONE) cap of what was called a Black beauty which he understands to be 10mgs. of apmhetamine sulfate anhd 10mgs of dexadrine. It rocked him.
Recently 60mgs. of Dexedrine did not do anything like the BB of the past. He tried to swallow some water and bicorbonate of soda an hour before the dose. He got a little happy but that was it. SWIM is thinking the combo of meds are stopping the dexedrine to produce the effect of when he was younger, much younger! He said he was thinking of stopping the bedtime Ambien and slowing the Benzo slowly and perhaps some of the opioids. Is there anything else he should/could try? Do you think he is on the right track with his plan? Suggestions? He says thanks.