Hello Tummum,
Much sympathy - I know how you feel. I'm 38weeks and my feet are huge, as are my calves and it's just made it above my knees. My feet feel like they're about to explode at times
When the skin gets really itchy and tight, I've found the best thing that helps me is aloe vera gel. Don't use creams, there's something in them that can irritate. Holland and Barrett have the 99.9% aloe vera gel on sale at the moment, reduced by £2 a tube. Get a couple! Put it in the fridge and then its nice and cool when you put it on. I find that takes the worst of the tightness out as it keeps my skin moisturised without irritating.
In terms of the heat, this might sound a bit odd, but what worked for me was hypnosis. I have a friend who is a clinical hypnotist who I'd been seeing for other issues, and then we got into some birth preparation hypnosis too. She did a bit in a session with me that I can keep 'renewing' and ever since then my feet have usually been cool to the touch, or maybe slightly warm, but not the burning hot they were before. It was a similar sort of method that is used when using hypnosis for anaesthesia, apparently.
Just saw my midwife this morning, and the only thing she could suggest that might help the circulation and reduce swelling is perhaps talking to a reflexologist or acupuncturist. Not sure on that. Think I'll have another chat with my hypnotist friend and see if there's anything she could do to help with fluid drainage from the legs.
At night, I have a bucket of cold water next to the bed, and dunk my feet in there when the tingling/tickly/itching feeling is keeping me awake. It's a nuisance but at least it means I can get back to sleep. Raising my feet above heart level does help a bit but it's so uncomfortable lying on my back that I don't tend to do that much. Was very breathless after doing it yesterday.