Iliotibal injury, I think?

I am 30 yrs old, in pretty good shape (5'10, 165/170, low body fat)- have been lifting some weights and done some semi-regular cardio off and on for the past 3-4 years. About 3 years ago while running I ended up injuring my knee, or what I thought was my knee. I experienced a sharp pain on the side of the knee while running on day, and essentially it hurt me for months, especially when I walked up/down stairs. I did some research and believe that it was an Iliotibial band injury (ITBS). Eventually, after several months of doing no cardio, it went away. I didn't run again for probably 1.5-2 years, and then only ran for 1-2 miles at a time. My knee/leg felt fine. Recently I decided to train for a 10K, and set out with a training plan. Things were going great. I was regularly running between 3-5 miles for the past month and then this past Sunday I was attempting to do 6.2, and that sharp pain started, and well...I kept running through it. Probably pretty dumb mistake. Anyway, was in pain while walking on Sunday, but Monday felt better....put ice on it, been taking Advil, rested the past 3 days, and then ran .5 miles yesterday. Felt fine. Then this morning, I decided to try 1 Mile. Pain came back at just about a mile, and now it kinda hurts. My knee cap area feels fine, but it's more on the side of the leg, and close to the femur, so I assume it's Iliotibial. Definitely the pain comes from the side of the leg, and then kinda radiates in the rest of the knee. I wear good running shoes - had my gait examined and bought the appropriate type of shoes. Any thoughts, and any recommendations to heal up? I was thinknig of just strengthening my legs for the next couple weeks - light weights, many reps, and then give it a shot while running. My race is in mid-April, and I desperately want to be alright for it.

Thanks for your help.