The other day, I was in a situation whereby I thought I was going to get into an argument with someone. I felt this rush if anxiety, nervousness, a bit clammy. But overall, I felt a bit more alert and wired. I'm guessing this is the fight response. Another example would be having to do a remote therapy session, again I felt the classic anxiety symptoms.

Fast forward to the next day and I'm anxious about going out to the shops. But when I was anxious about this, I felt floaty, lightheaded, unable to stand, thought I was going to faint, but mainly just completely exhausted. I didn't have palpitations, no sweating, didn't feel wired or on edge, just really really fatigued.

What the hell is going on? I don't get why one is sort of classic anxiety and the is basically some sort of fatigue attack. Can anyone relate?