Thank you for sharing Julius
It appears that by the medications you currently take that you may be already prone to having anxiety and panic attacks? One of the medications, clonazepam, is a benzodiazepine which over time can cause rebound or "break through" anxiety due to its affinity to the GABA receptors and rapid tolerance build up humans have to these types of medications.
It is good that you do refrain from alcohol as that could make your anxiety worse and also interact with your medications.
I am not a doctor and essentially we are discussing this over the internet, but I do not think your anxiety would result from taking a single 100mg injection of testosterone. It sounds like you have a baseline tendency for anxiety. You may find that restoring your testosterone level with TRT may alleviate some of your anxiety, as many men experience.
You should discuss this with your doctor so that he may investigate your current medications, especially the benzodiazepine (Is it being used daily or as needed, for example?).