I would focus on getting a quality assessment of your neck. No just an MRI and generic read. An assessment by a physical therapist and/or physiatrist (Physical Medicine and Rehabilitation MD) who understands subtle neck injuries and how they can wreck your life. I bet you slept with poor head and neck posture. This would cause neck inflammation and cause your symptoms to get much worse.

Nothing you are experiencing indicates a concussion as the only cause. It is far more likely your symptoms are upper neck. Inflammation restricts blood to the brain stem. This interferes with temperature modulation, balance, vision, and many other functions.

Being and getting high is very problematic. It hides the true source of symptoms.

Using drugs also indicates a high likelihood of depression and/or anxiety and stress related living. Those pre-existing conditions make the symptoms of any concussion much worse and longer lasting. Many need to properly treat those conditions as part of the concussion and neck injury recovery.