To answer you last question first it depends on the cause of the oedema in your legs as to whether or not it will go away.
Plantar fascitis is a common and annoying problem that is difficult to treat. It sounds like you are doing the right things. An anti-inflammatory medication might also help. Putting a bottle of water in the fridge and rolling your foot over this particularly over the sore area when your sitting to try and stretch out the plantar fascia can help. Physiotherapy
can help in showing you the correct type of excerises for this condition, they will also sometimes give you ultrasound
therapy. in very resistant cases an injection of local anaesthetic
into the origin of the plantar fascia on the heel bone can help but his is quite painful unless you have a general anaesthetic
. very rarely would one need a surgical release of the plantar fascia to deal with the pain.