Injury/recovery question

[lyorn]

I banged my head badly on an open window yesterday (badly means, I fell back and sat on my butt for a few minutes before I was able to get up again, and I have a bruise now right above the hairline that has started migrating towards my right eye). My neck muscles are still somewhat in shock from the impact and cause pain and some numbness in my right arm. My vision did not do anything weird, and there wasn't even much of a headache.

I know from experience that it would be a very good thing for the muscles if I went to the gym and did some lifting. But I fear it might not be that good for my head.

What's your opinion and advice? Rest days? How many? Or back to the gym tomorrow?

To make this more annoying, I'm trying to get back in shape after a summer break that somehow extended until after my vacation earlier this month...