I have run several half marathons and am currently training for the New Forest Marathon in September - my first. I have completed a 15, 18 and 20 mile runs with the last two being hard but manageable. My right hip has just started giving problems, and causing mild pain even on short runs. While I know I need to let my hip heal, I'm concerned about losing fitness with the marathon 3 weeks away. I have new shoes - Asics 2070 which suit my running style and weight. Does anyone have any suggestions or advice????