The advice already given is good re: resting, rolling tennis ball under foot while sitting down doing other stuff.
Cushioned soles with a small heel are good (ballerina pumps are TERRIBLE for feet).
Night splints and taping may help as well (one of the posters talks about sleeping with her feet off the edge of the bed, which given that she sleeps on her belly is good, if you sleep on your back it will be bad).
PF will take a long time to go away, I am afraid.
Look up eccentric loading stretches for some advice as to stretches which help. I usually advise people I see to have a towel/dressing gown belt by the bed and in the morning make a loop around the ball of their foot and, keeping their legs straight, and just flexing the ankle, use the loop to pull their foot upwards (i.e. so that their toes are pointing towards their head). When you feel discomfort, hold that position for 10 secs, then let your foot down slowly. Do 3 x 10 sets of those as often as you can during the day.
If you have stairs at home with a handrail (must have handrail - all will become clear) you can also do the following exercise.
Stand with balls of feet on step, with your heels off the step, and hold the rails. Slowly lower yourself so that your heels drop below the level of the step you are on. Again, at the point of discomfort, hold for 10 sec. Then (very important), use YOUR ARMS to push yourself back into a normal position (don't just flex your calf muscles to do it).
The reason for this is that "eccentric loading " means loading the tendon while it is being stretched. Using your calves makes it concentric (loading tendon while it is being shortened) which is exactly the opposite of what you need.
Think about anti-inflammatories as well if you are going to be on your feet for a while - don't wait until you get pain. If there are no reasons why you can't take an anti-inflammatory (e.g. asthma, or stomach ulcer, or interactions with other drugs), these can be really helpful, and can be confined with regular paracetamol.
If PF is really bad, then a steroid injection can sometimes help, but it's pretty painful.
other options are ultrasound treatment from a physio.
I hope yours improves soon.