Post concussion syndrome

I just wanted to ask if anyone else has been through the stupid battle of one week, you are training below symptom threshold then the next if feels like you are back at square one, for some background information I've been dealing with headaches for about a year now I've started physio 60 days ago lots of improvement, but I hit a rough patch where everything I built up now gives me headaches and I've had to drop all the way down, this condition has just made me feel so alone and wanted to know if there was others dealing/dealt with this painful process