My CO alarm never went off but when they pulled my oil furnace last year there was a bit of soot in the 'hot box.' I used to have bad colds and sinus but now that I have a gas furnace, that problem has disappeared.
I don't know when the old furnace was installed but my house went up in 1952 and the call for service sticker used a single digit for the exchange. LoL
Those old furnaces can be fixed forever until the heat chamber burns through. Then, you are screwed. Unless you find that part to keep on standby you might want to start saving toward a new furnace.
Good luck!
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