Rosa,

Welcome to NeuroTalk. As Hockey said, peoples experiences are widely varied. Since you can work out for 1.5 hours multiple times per week, it sounds like you are doing well. A phased return to work sounds appropriate.

The vitamin regimen makes a big difference for some and only a small difference for others. It takes time to see a difference. It helps the brain tolerate stress.

Don't neglect your neck. You may have a subtle upper neck injury that gets inflamed. Icing and physical therapy can help.

You likely need to learn to recognize the subtle symptoms of over-doing it. Needing to reread a line of text or strain to focus your eyes or any such extra effort is a sign that your brain is becoming fatigued. Taking a short break will help. It may help to wear ear plugs to reduce background sounds while you work. If you can arrange to have a quiet break room available so you can take 10 minutes to rest your brain, it may be a big help.

The most important thing is to learn to listen to your own body/brain. Then you can moderate your activity level to avoid overload.

Recovery is not a single achievement. It is more of a work in progress where we have a moderated life to manage symptoms. Some have more residual symptoms that others. There are no ways to predict when and how symptoms will recover.

My best to you.