Thesquid,

Welcome to NeuroTalk.

From the description of your injury, I would be concerned about an undiagnosed and untreated upper neck injury. They can lead to BP and pulse irregularities. You don't need to have a stiff or sore neck for your neck to cause symptoms.

I am more concerned about conservation of mental energy than physical energy. Some light physical effort is important so you maintain good blood flow to the brain. You want to avoid jarring the head and neck as is common with jogging.

Moderated cognitive effort is important. So efforts that push into fatigue. As soon as your recognize any fatigue, you should taker a break.

You don't tell us about your age and other attributes such as living situation, etc. Living environment factors can contribute to fatigue. Noise, diet, relationship stresses, etc.

More later.

My best to you.