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Nitrogen is a scam to get people to pay $20 to inflate their tires. Unless you are doing 200 MPH at the track, it is not worth the money. Nitrogen can be freely mixed with air.
Replace the valve stem caps, they protect the Schrader valve and threads.
Air does not leak past the valve. The colder weather this time of year causes the decrease in air pressure in the tires. It's no big deal, completely normal AS LONG is it is only 2-3 psi. If you have one tire that has more pressure loss than the others, check it out for a puncture.
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