Coconut oil for the chafing, maybe? It's also an antimicrobial, so if it's being caused by anything like that, the oil well definitely help. Good luck. Not too much longer now!
Girl.for the chafing I would put a little diaper rash cream or baby powder. As for the swelling I use an ice pack. I have had swelling for the past few weeks between my ankles and my whooha it's rough. I told my friend the the other day I have loved being prego until I hit 8 and half months. It's painful and so uncomfortable. Good luck to you and your down stairs. Not to long to go and we will have our babies.