I dont know if I experienced something similar, mine was more of a one off, or rather I allowed it to happen only once.
Panic attack is possible I think, but in my experience panic attacks are often telling you something you don't know, or dont want to know, and that doesnt always mean its psychological,
i would suggest having a look at where you are in your life, obviously a muso, "hopefully making good music" has anything happened recently or come up in any way, do you feel different in some way, eating habits, etc,
i needed to stop everything to figure some of my stuff out,
careful in your industry too, what gets slipped into your drinks, sometimes by people who like you, sometimes you dont notice it, until later, or the effects are clouded, best idea is have a talk to your doctor, and try some meditation, its good for bass players
