I sympathise with your husband. I have been on Stalevo (100 at 8.00am,11.00am and 75 at 1pm, 4pm and 7pm) and find I get dyskinesia - toe and foot curling as the dose wears off usually, but it gets worse as the day goes on and seems sometimes to occur mid-dose as well.
I'm due to see my parkinson's nurse in 2 weeks and am going to discuss this with her. I used to be on Sinemet 3 times a day and do not recall things being this bad. Like you, I wondered if it could be parkinsonian symptoms getting worse. I have been diagnosed for 4 years.