About 6 weeks ago I suffered a concussion because the seatbelt on an amusement park raft I was in broke and I went flying into a hard plastic seat (fyi amusement parks make you waive away your legal rights in most states.) went to ER- took a week off of work. About 9 days after I was still having brain fog so I went to a concussion center. The doctor said I would heal etc. a month after I was still having tension headaches so she sent me to PT for my vision. I have had two sessions and was feeling much better. The doctor told me no risky activities and contact sports— so today I decided to play golf. I figured that wasn’t risky— well it was for me. The sprinklers were on and I slipped and fell on the grass/ I did NOT hit my head but I have a slight headache.
Anxiety? A slight jostle that reactivated my symptoms?

I think I should just sit inside for the next month and exercise via stationary bike because I am suddenly accident prone.

If you have someone that can help you measure if your proprioception is off that might be useful. I had a concussion and my ability to accurately understand the location of my body was messed up.

Other thing you could do is test if you are hearing in the right direction. Close your eye and have someone take a clicker and make noise. Then point to where you think the noise is coming and see if it matches. Your injury may have messed that up as well.

I would do what you are doing exercise safely but also take

Creatine
Omega 3 (Good kind do some research on legit brands)
Magnesium

If I had my injury again I would dose those at the beginning good luck

Talk to a dr to see if you had enough force for another concussion.

If not, then possibilities include neck trauma or "migraine" from sudden overstimulation of movement. The migraine from overstimulation situation is tricky. Only "Heal your headache" talks about it and Dr Kutcher in Utah can diagnose it (other top neuros I saw were not familiar).