no, a complex-complex sentence is just a complex sentence. there is no such thing as a complex-complex sentence.
A compound complex sentence is when you combind a compound sentence and a complex sentence.
Your example works, though tension can also refer to stress, strain, or suspense, not just panic. For instance, in a story, you might say, “The tension in the room was palpable as everyone waited for the verdict,” which shows nervous anticipation. It’s a versatile word depending on context.
A complex sentence has a dependent clause and a compound-complex sentence has two independent clauses.
There was tension between the two stepsisters.
This complex sentence is hard to diagram. A description of a mental disorder could be characterized as a complex sentence.
A complex sentence is a sentence consisting of an independent clause and a subordinating clause.
After we argued, there was a lot of tension in the room.
Relax, you carry so much tension in your shoulders.
I feel a lot of tension in the office today.
A good joke had eased the tension in the room
The difference between a compound sentence and a complex sentence is that a compound sentence has two independent clauses, connected by a Coordinator. A complex sentence on contains one independent clause. A complex sentence also always contains a subordinator.