Fatigue and anxiety

Hey. I’m new to this, and I’m coming close to having a proper ADHD diagnosis. So, I’ve been gathering myself together for the last week and I’ve noticed patterns : I can be hyperactive for like 3 weeks, like A LOT, no time to rest whatsoever, and then there are always one or two days in a row when I feel exhausted or get sick, and feel like I have 0 energy and do absolutely nothing. When I’m like that I often feel really anxious because I feel like a failure having those mood swings, I feel good when I’m in action. Does this happen to you all? Can ADHD cause anxiety?