You will have a long and stressful life if you need to understand every little difficulty. S... happens. Often, the only thing we can do is move on.

You say it is your personality to be detail oriented. It is best to focus this detail oriented characteristic where it is beneficial, not where it just raises anxiety levels. It took me into my 40's to realize that not every detail needs my attention. It is not healthy. I know many who were / are detail oriented who developed bipolar disorder in their later life. Their hyper attentiveness finally exhausted their brain until they crashed into depression.

Learn the serenity prayer.

Just because you do not make symptoms worse from an activity every time does not mean that activity should not be moderated.

You say you are scared and you want to get back to living your life as soon as possible. There is nothing you can do to speed things up. You can only slow your recovery. Accept your current state and learn to live with it. Over time, things will get better, probably when you are not even aware.

If your only symptom is head aches, you have nothing to be scared about. Take an ibuprofen or such and move on.