UFO(disk, black)near commercial plane, glowing light around it, maybe following plane, then disappeared.

I was exercising(walking)in a park, mostly was stationary to breathe some fresh air. The day was sunny(beautiful and very windy)with allot of huge clouds in the sky, then I noticed a shining light that hurt my eyes, I then saw a black disk like object close to a commercial plane for a minute a so, and decided to take pictures of the plane. As I looked at photographs to my surprise there was what I saw to be a UFO hovering near the clouds close to a commercial plane as if it was examining it and anything around. In the photograph is the same type of disk like shaped UFO with a light aura around it as captured by air force pilots on TV, in the next photo you can can see the UFO has clearly vanished without a trace. Before the sighting I was experiencing headache, anticipation and anxiety for unknown reasons. Also I suffer from sciatica and was experiencing terrible neck and back pains.