I was told to take ibuprofen by my doctor and it didn't seem to do much, then one day the pharmacy was out but they had ibuprofen with codeine and it helped, my headaches, nystagmas and fatigue went away.

I told my doctor this and he said the symptoms must be psychosomatic and that codeine doesn't change anything.

I have had pcs for 15 years following a fight where I was hit in the temple 3 times. The only thing that has helped is exercise and now codeine.
I'm waiting on results from a ct scan because my doctor does not believe I have had a concussion, I also suffer occasional nausea.