As far as I remember, I solved my problems with dry eye syndrome in 1.5 years (or maybe 2 years), but at first my exercises were irregular. I usually did less exercise in cold weather and my condition worsened at the time. The recovery process in my case was non-linear.
Depending on your condition, in addition to physical exercises, I would also recommend guided meditations: meditation on loving kindness (especially this meditation), compassion and others. Among other factors, they allow you to be more stress-resistant in the long term. Perhaps at first it is better to use audio recordings of such meditations, you can record them yourself using some text or find someone's record on the internet.
(Take into account your current state - this is important! I tried to do these meditations in the acute phase of my problems, sometimes my condition got a little better, sometimes a little worse. At some point, I postponed my meditation until the time I could do it. Then when I got a little better, I went back to them).
Yoga-Nidra can also be useful, as it also allows for deep relaxation.