Thanks girls. I actually phoned the hospital to ask a midwife about the lingering aspect and she said as long as there was no redness at the site and no lump and I still had sensation in my foot not to worry, especially as I haven't had blood pressure or fluid problems. With a lump or redness she said to call again and they'd get it looked at because some women get dvt or similar during pregnancy - thankfully it has subsided today - fingers crossed for a cramp free night tonight, it's another 36 hours before there'll be a pharmacy open near us to get any magnesium...