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Hello again, it can certainly be fixed, but the furnace's heat exchanger should be examined to be sure that the heat exchanger is not cracked or corroded and leaking carbon monoxide into the home.
You should buy two carbon monoxide gas detectors and put one your bedroom area and one in the kitchen living room area.
If the furnace is not producing carbon monoxide a new blower motor can be had by taking the old one to Grainger Industrial supply and asking them for a match up. then install it.. It will not be an overly difficult task.
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I am off to bed now, and will pick up your response first thing in the morning.