Welcome to HCM,
As suggested by my colleague it is possible that aerophagia
can cause bloating
but there is quite possibility that being bed-ridden could be the cause of your bloating sensation,at the same time your congestive cardiac failure causing hepatomegaly
can give these symptoms.If all the investigations are normal then there should be no worries.You just need to see that bowel movements are normal.
Hope your query has been answered well by us.
Have a healthy life..