Hello Laurie and welcome to Neurotalk Support Groups,
I am sorry to hear of your trouble with PCS after your accident but thank goodness you are still here with us. That must've been very frightening. It can take time recovering from PCS. It seems like a good thing that you were feeling better and you are certainly doing the right things being careful and decreasing stimulation. Hopefully it is now just a case of too much too soon. Fluorescent lights aggravate a lot of people and can set off headaches. I wouldn't be surprised they bother you.
You will find information on PCS here
Traumatic Brain Injury and Post Concussion Syndrome
The Search feature at the top of each page will help you look for specific topics. FAQ answers many common forum usage questions.
This is a wonderful video from Jane Macgonigal, a game designer, doing a TEDtalk after her PCS and recovery.
https://www.youtube.com/watch?v=lfBpsV1Hwqs
I hope you find relief and healing soon. There are many supportive people here. Welcome aboard.