How do you go at home with the lights out? I suspect by the fact that you always have lights on at home that you've learned from experience that you have trouble in the dark - in general, not only in the forest.
That makes sense; our balance system relies on vestibular (inner ear balance organs), visual and proprioception (our inate awareness of body position - what makes us able to touch our nose with eyes closed). If one system is degraded, the others take up some slack... while they can.
Often when the vestibular system is compromised, the brain learns to ignore the vestibular signals and instead relies on visual input to identify up from down, and whether you are rotating in space (which are the sensations we usually get from the inner ear structures). Works acceptably well when vision is working. Not good in darkness.
In many cases, only one ear is compromised. Most of the sensory input is by comparing left and right signals; if one side is zero signal (or constant or random), the brain gives up and ignores them both.
It's possible to train your brainstem balance system to ignore only the broken side of your vestibular organs. That's a specialised branch of physiotherapy. If you have unilateral deficit, it should be possible to get close to normal function back again (there will always be some weird effects with sudden movements that overwhelm the compensated system, but gentle movements you should be okay).
Bilateral deficit makes things trickier, but again, not common.
First step is a proper vestibular assessment to figure out which sensors are broken, on which side. I don't know about your country, but in mine that would require a referral to a specialist vestibular audiologist by your doctor - if there's a specialised eye and ear hospital anywhere nearby, they would be a good place to start. A thorough assessment should be about a 3 hour session. They may also want to refer you on to an otolaryngologist - mainly to make sure whatever has caused you damage has stopped.
A diagnostic clinic should then know where to find a vestibular physiotherapist.
[credentials: I'm an audiologist. I have trained in vestibular assessment, but I don't currently practice in that area]
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