Hip flexor pain

Hi! I’ve been dealing with hip flexor pain for about two weeks. I feel no pain at rest, but it feels very sore while walking and I feel sharper pains with more impact. I took the past two weeks off running but I am still feeling pain now when I try to run. I am eager to get back into it as I’m training for the Chicago marathon. Has anyone ever dealt with similar pain and how did you manage it? Any advice would be appreciated!