Advice for improving nausea and balance post concussion?

Hello

Apologies for long post, but looking for advice please

I had 2 back to back concussions ( 2 weeks apart) approx 1 month ago. After about 9 days I returned to work (,office job) and was pretty much feeling 100%

A week and a half ago I introduced light strength exercises back into my routine as I was feeling really well. After my 2nd strength session I began feeling nauseous and headaches again. I tried sleeping it off and woke up feeling 90% and went to work, and I would fluctuate between having symptoms and barely having symptoms throughout the work day, and felt pretty bad by the end of the day. The same thing happened the following next 2 days

I then decided to not work and go to a doctor. He recommended atleast 1.5 weeks off work to lay down and rest. I'm currently on day 4 and I have been resting 90% of the day in a dim light room then getting up to just cook myself food or walk in backyard.

However I feel no improvement at all, if anything I was waking up feeling better in the mornings the days I was working through the symptoms. My baseline symptoms are constantly hovering around a 1 to 2/10. And now that all ive been doing is resting, its now thrown off my balance a lot. I went on a 10 minute walk yesterday and felt unsteady on my feet and very nauseous. Ive walked in my backyard for 5 minutes and felt the same thing - this has only started since I've stopped working and started resting.

I've spoken to my gp twice and he's insisted I just rest in a dark room for 1.5 weeks until I'm better. But I honestly feel worse and the balance issues have only started since I've been resting all day.

Has anyone got advice on how to go from here? Thanna