I experience most of what you described during hypomania. It also lasts a few days, with the severity fluctuating. The racing thoughts, not giving you enough peace to concentrate on any one topic, convo or train of thought. Causing confusion, distress, frustration, making stupid mistakes, a lot of times not understanding simple instructions, or failing to accomplish certain tasks you are usually very good at because everything is so mixed up in your head. During these times I swear I can't even add and subtract because numbers cease to make any sense in my head.All of this just fuels my anxiey like a MOFO!
And don't get me started on the intrusive thoughts! Maybe its because I'm just lucky like that but my OCD kicks into high gear during these times and the thoughts play on an unrelenting loop in my head, its not uncommon for me to have the same loop for a full week. Drives me nuts, ready to rip out my hair!

Scary how you drove on the wrong side of the road, thank goodness I don't drive. Please take extra precautions while in this mood state.