It can not be stated that your problem is only from performance anxiety.
You can still get morning erections with low T and from other causes. And in fact physical causes are on a spectrum, and can start with intermittent dysfunction. It is with advanced disease that complete impotence occurs and you don't want to get to that stage.
Cialis would not be indicated for psychological causes: therefore, find out what diagnosis your doctors are using.
Thyroid disease and other undiagnosed diseases.
See a medical doctor first.
I am a double board ceritified clinical doctor.
You have not stated that you have any anxiety at all, but this would be another cause of this problem.
However, anxiety can be secondary to medical causes as well.
I would suggest
A: Internal medicine doctor and urologist evaluations.
B. Then, depending on findings, psychiatric or psychological evaluations.