What is causing my headaches and could it be cardiac or vascular in origin?

For that last two years, when walking upstairs or under exertion, I get a brief intense headache that subsides quickly (<60 secs) once I and take a break (though I somehow feel that there is some 'tenderness' and it is waiting to restart if I push myself). Its almost always on the right side behind or above my eye and its very immediate once it starts and very strong.

I also recently got this when sitting in a hot spring in New Zealand; it subsided once I moved to cold water. I do not otherwise get headaches and never have other than brain freezes from eating cold foods. I did concuss myself 3 years ago. I turned my ankle and clipped my right temple. I had blurred vision and light sensitivity for several weeks. CT scan in the ER did not show anything overly concerning and eye doctor examined eye and pronounced them clear.

I went to a neurologist 3mos ago and he did do an MRI of my head including focusing on my eyes which was all normal. He recommended taking ibuprofen for 6 weeks in case its residual swelling from the old concussion. I have taken it intermittently but he did not sound overly convinced and he was quite confused at various points in our discussion so I think he may not have remembered that the concussion was some time ago.

I am 45, female, overweight with asthma. When I first noticed getting short of breath 5 years ago when climbing stairs I did have a cardiac stress test and also wore a halter monitor for 48 hours and all was well.

A chest CT to check on my enlarged thymus gland did reveal some aortic hardening/calcification but I don't believe it was noteworthy as we did not discuss it, it was just in the write-up from the radiologist.

Other than this I don't have any other symptoms or disorders likely related.