2. Sever Headache
If you have very high blood pressure then this can lead to a severe and chronic headache.
This is caused by numerous things. Specifically, the heart is now pumping hard and the body is tensed and stressed. This causes tension in the muscles around the face, head and neck and it means that the blood and oxygen supply to the brain may be impeded. These things together can result in significant pain and discomfort in the head which might come and go or might continue indefinitely.
In the short term, try taking some aspirin for the headache. Not only is this an effective analgesic, but it is also a blood thinner meaning it can help to lower the blood pressure in the short term.