If exercise does not make things worse, then go for it. If it makes things worse, either you may not be ready to exercise or you're doing too much and need to slow down/do less.

Start small and build up. I don't know where you're at physically, so I'll just say start with a 5 minute walk. If that goes okay for a week or so, try a 10 minute walk. Progress to walking up and down the stairs. This gets the heart rate up very quickly. Then progress to running if your head can tolerate the jostling. If you feel light-headed, get a headache, or get dizzy, take a break. I take breaks during exercise after every set and up to ten minutes sometimes. You may feel fine during exercise and feel really bad afterwards. This is a good sign that you did too much.

Everyone's brain and body are different, but for me, the worse I felt the less I could exercise. Besides walks, it was mostly counterproductive. Now that I'm feeling better, the more I can exercise and the more benefits I get from it.
Also, remember to breathe and not build up tension in the head.