stroke or brain aneurysm headaches + knot in my mid-back section

This all started about 2 weeks ago. I woke up with a knot in my mid-back section. I brushed it off because I get these once in a while and with stretching/exercise they go away within a couple days.

However, a week later it was still there. But now it was worse. The muscles in the back of my neck were also getting stiff and sore. It got to the point where I couldnt touch my chin to chest without serious pain.

Then, one night i got a strange tingling sensation in the back of my head. It felt really cold. I got 2 flashes within 5 mins of eachother.

Since that night, I have been getting strange headaches. They last for anywhere from 5 mins to an hour. These aren't painful headaches at all, instead they feel like a bubbly sensation within my skull. It almost feels like something tiny is creeping around in there. Strange...I know.

Also, these weird headaches only happen in the evening between the hours of 6pm and 10pm. They do not appear if I am doing something like the dishes or shovelling the walks. They only appear when I am sitting around on the computer or watching the TV.

The headaches aren't centralized to one location. They appear everywhere, mainly the back of my head, but can appear above my eyes, the temples and the top of my head.

I have been reading on these medical sights, and the closest symptoms I can relate with is either a stroke or a brain aneurysm.

I am 27 years old male with an active lifestyle, i work out 2-3 times a week. However, before this I smoked 10-15 cigarettes a day and occasionaly drank 4-6 beers a night (2-3 times a week).

I am too scared now to pick up a beer or smoke.

Is this godsent for me to quit these vices...or am I in store for something tragic in the near future???

Kindly respond.