[Idiom] simmering with rage

[Ashiuhto]

Is the following sentence acceptable?

While I was trying my best to restrain my fury and act as if nothing were on my mind, deep in my heart was simmering with rage.

 

[billmcd]

Is the following sentence acceptable?

While I was trying my best to restrain my fury and act as if nothing were on my mind, deep in my heart was simmering with rage.

You need a subject for the last phrase so I would place "I" between heart and was.

 

[Ashiuhto]

While I was trying my best to restrain my fury and act as if nothing were on my mind, deep in my heart I was simmering with rage.

 

[bhaisahab]

While I was trying my best to restrain my fury and act as if nothing were on my mind, deep in my heart I was simmering with rage.

That's right.