I suffered from plantar fasciitis about two years ago and orhtotic insoles definitely hepled cure the problem, now I would never run without them.
Perhaps the pain in your hip is due to having had an imbalanced running action (caused by compensating for the pain in your foot). Now that the foot is cured you may have returned your previous, pre-injury running style. Perhaps your body just needs to adjust back to the more balanced action.
When I feel a cold coming on I increase my intake of vitamin C (100mg tablets). There is evidence to show that this can decrease the symptoms and during of a cold by about 30% and it certainly works for me. In addition I take zinc tablets, which are good for the immune system.