Stop it with the rest. You need to be active in some way. Sleep only during sleep time. Low stress activity as much as you can the rest of the day.

I row 4000 meters in 20 minutes. The first week I rowed 3000 meters, then 3500 and quickly got to 4000. 4000 meters in 20 minutes is a good low stress workout. I've had women out row me. You should be able to to 3000 to 4000 meters. I'm and old codger at 62. When I am done, I swim for 10 minutes or play ping pong with older guys who kick my butt.

Why wait on the vestibular assessment ? Get it done so you can understand what is going on and lower your stress level. Look for a vestibular therapist who understand concussion issues. Some PT's are good at concussion related vestibular issues.