I was also a go-getter. I taught (high school kids) through the whole first week after my concussion. Finally, at the end of the week, I was having physical pain from kids giggling and realized I needed to stop.

Even the first weeks I was home, I was resting my body but not my brain -- I was still checking work email and grading papers and sending in lesson plans. I tried to come back for a full day the second week and then had a grading marathon getting semester grades done the next day. This led to a second and much worse setback which ended up keeping me out for the entire second semester.

So, take the time you need on the front end, and work up to it slowly when you try to come back. The more rest you get early on, hopefully the less you will need over the long haul.