18M, head injury as a kid, now a bunch of weird symptoms

Backstory: skull fracture and head injury as a kid from a car accident. Was fine for years afterward, but over time I've built up this cluster of symptoms and I honestly can't tell what's connected to what anymore.

The neuro stuff is probably the most disruptive — frequent, sometimes severe headaches, flashes of light in my vision, brain fog and trouble thinking clearly during episodes, random internal "vibration" sensations, numbness and tingling in my legs, and a burning/tingling feeling across my skin pretty much everywhere. Memory-wise I usually know what I mean but blank on the specific word for it.

There's also some autonomic-feeling stuff — near-fainting, where I don't fully black out but get close, sweating way out of proportion to the actual temperature, some general temperature regulation weirdness, and occasional trouble breathing right when I get up from sleep.

The part that worries me most is probably growth and development. Puberty started around 15 and then basically stalled — I've barely grown since, my muscle mass and tone are low for my age and hard to build no matter what I do, and development in general seems behind where my pubertal stage would suggest, even though I'm still growing body hair like that side of things never stopped.

On top of that there's some physical/structural stuff — an anterior pelvic tilt and posture issues, and some changes to my jaw and midface that I've noticed since the accident. Skin-wise I deal with chronic dryness, hyperpigmentation, sun sensitivity, and some thinning/sagging. And generally I'm just tired all the time, low endurance, trouble concentrating.

With everything going on, the fatigue, the skin stuff, the structural changes since the accident — I keep coming back to wondering if it's something pituitary or hormonal, like the injury messed with regulation somewhere along the way and it's just been compounding since. I honestly don't know if that's the right track though. Endocrine, neuro, both? If anyone's run into something similar or knows what I should actually ask to get checked for first, I'd appreciate it.