Diagnosed with probable viral meningitis around four years ago, having numerous issues?

I am a 17 year old male, and was diagnosed with probable viral meningitis around four years ago.
Since then, I have experienced some minor neurological after effects, such as including Benign Paroxysmal Positional Vertigo a few years ago. However, since last December (nearly a year), I have felt much worse.
Currently, I am experiencing:
Muscle and Bones Weakness (persistent for a few years)
Vision issues (some black spots, particularly in particular lightings- diagnosed with light sensitivity and I wear glasses)
Memory problems (Quite severe- feeling of blankness/brain fog)
Speech issues (occasional- mixing up sentences)
Disorientation (occasional- feeling of dizziness- cured with food/water)
Headaches/ tension (back and sides of head- not very often/severe, made worse with blue light)
Lack of stamina (Easily physically tired)

I have had numerous recent blood tests, which have come back clear. I also had an MRI scan a few years ago shortly after the Viral Meningitis. My Doctors seem a bit perplexed at the moment, and their only course of action was a psychological examination to test for anxiety (which came back completely fine) and lifestyle changes (which seem to have helped slightly, although not with the memory/concentration).
Any help would be greatly appreciated, as I am concerned it will continue to have a very adverse affect on my life (particularly school).
Thanks again.

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