I completely feel your pain. Literally.
I've spent the last 11 months coming back from tendonitis in my knee. I'm still not 100%, but I'm about 90%. For several of those months it was hard just to walk, let alone run. At about 5 months in, I started walking on a treadmill at a pace of only 2.3 mph!

The worst part was that in the beginning few months, it got so bad that I developed complex regional pain syndrome that caused my quadricep muscle to atrophy. Fortunately, I'm not giving up and I refuse to acknowledge that I can't come back from this. I still can't run normally yet, but I ran across the room the other day without falling down, so I'm focusing on that progress and trying not to get depressed.
My best advice is this: listen to your doctor, but ask as many questions as you need to to understand your situation. If you have to go to therapy, go to therapy and DO the exercises. Do whatever exercise you can, even if it's not running. Considering a recumbent bike, pilates, anything that will keep all the other related muscles in your body working. I learned that yes, you have to get the inflamation undercontrol in order for the pain to stop, but it's just as bad for your muscles to weaken. Balance rest and small workouts. Taking a week off will not hurt you, but taking 3 months off from all use of that muscle group can. Also don't be afraid to seek out other doctors or therapists if you aren't satisfied.
My doc started me on ibuprofen (I think that's advil, right?) but I had to switch to Aleve b/c advil bothered my stomach.
Another trick I learned was to indulge myself in whatever music helped get me through the awful PT exercises and other workouts. My ipod saved my PT sessions!
Also, I wanted to add that I too needed to lose weight, just as my injury occurred, plus I was trying to prepare for getting pregnant again (lose the old baby weight). It's so hard when an injury crushes your hopes and plans (like your race). Injuries are a mental thing too - it's hard to keep your spirits up throughout recovery. I'm glad you turned to the DIS for support. DIS helped me emotionally, that's for sure.
Good luck. I hope you get better results that you might be anticipating.
