Where do I place commas in a compound-complex sentence?

I don’t know if I should use a comma before "and" in this sentence.

I grunted from the weight of the dresser and after a pause, the doorbell rang again. I gave up with a huff and went outside.

I think "I grunted from the weight of the dresser" is an independent clause and "after a pause" is a dependent clause. Thus, there should be no comma before "and". "After a pause" also connects to the independent clause "the doorbell rang again", so there should be a comma between the two.

Am I correct in my assumption?