Had a hip flexor problem last spring - saw physio and osteopath, both had the same opinion, sort of, basically stretches (lots and various) and don't overuse. Problem was persisted in trying to train (having an entry for FLM) including cycling and swimming - but ultimately decided everything including the stretching was agravating it, so made conscious decision to rest it until it was healed, then build up stretches and running gradually.
What does a rotated hip mean? My problem apparently stems from lack of flexibility in the hip, hence the stretches, so not sure any advice I give would be much use except to get the cause of the problem explained - medical bods seem often to chuck out a diagnosis with some treatment recommended without explaining what the treatment will achieve - hopefully they know and are assuming we'll know too - otherwise they are guessing!