Unexplained neurological/visual symptoms for 3+ years – seeking advice

Hello,
I am a 23-year-old male, and for more than 3 years I have been struggling with a set of symptoms that are difficult to describe, but significantly reduce my quality of life. I would like to ask for advice on what this could be and what direction I should take next, as specialist evaluations so far have not led to a clear diagnosis.
Main symptoms:
• “Strange vision”: It is not blurred vision, but rather a disturbance in depth perception and spatial awareness. It feels as if nearby objects appear farther away (and vice versa), as if my hand-eye coordination is worsening, or as if my vision is “dizzy” and I am not fully present in space.
• Physical pressure: During stronger episodes, I feel significant tension/pressure around my temples, the outer parts of my eyes, and the inner corners of my eyes.
• Seasonality: The symptoms mainly occur from late spring to early autumn, with the most intense period during summer. Last year, symptoms were present on about 90% of days during the season. In winter, they are much rarer, almost absent.
• Psychological impact: When symptoms are present, I am unable to concentrate, and after a while I develop a deep depressive mood.
• Duration: Each episode lasts about 1–3 days. Sleep sometimes helps, but not reliably.
Medical history / What has been done so far:
Over the past 3 years, I have consulted more than 60 doctors (both public and private healthcare) with these exact symptoms, but unfortunately no clear diagnosis or solution has been found.
• Neurology: I have been diagnosed with migraine, but I have had migraine for over 15 years (the visual disturbance only started 3 years ago). Acute migraine medications help with the pain, but do not prevent or relieve the visual symptoms. MRI and CT scans were negative (except for a small incidental cyst, which doctors say is not responsible for my symptoms). Migraine with aura has also been considered.
• Ophthalmology: No abnormalities found; structurally healthy eyes. My vision is otherwise perfect both for near and distance.
• ENT (Ear, Nose, Throat): Mild deviated septum and past sinusitis, but no current inflammation.
• Other: Cardiology, endocrinology, pulmonology, and lab tests (blood work, blood pressure) are all within normal or near-perfect ranges.
Thank you for taking the time to read my post and for any advice you may have.