Britta,
Congrats on the 50lb weight loss!!! You should be really proud of that!! I've lost 40 pounds since September. But it's not from running. When I did the C25K program last summer, I actually ended up gaining 4 lbs. I was pretty pissed then, because what the hell- I had been running 3x a week for several months. When I got really sick for 3 weeks, I stopped running and decided to focus on my diet. And I mean REALLY focus on my diet. I read a dozen books about nutrition trying to figure out the right macronutrient ratio - especially for runners. A friend recommended a book by Gary Taubes and from there I found a book called "Wheat Belly". From October to March, I wasn't exercising at all except lots of walking because I live in the city, and I lost between 25-30 lbs. I only started running again in March. So what I learned from that is weight loss is less about exercise and more about diet. Hope that helps.
With that said, I can completely relate to your weight loss frustrations. But at some point I had a shift in thought, and decided instead of trying to aim for a specific weight, that I would aim for a range of 10 lbs. That way, I wouldn't beat myself up too much about being a few pounds over my goal every once in a while (which I am now). I'm still below the high end of my range and I know that with proper eating it'll go back down again (I've been stress eating because of my upcoming HM, at least that's my excuse). Why is it important that you lose 3-4 lbs? Weight is just a number. Someone that is athletic and weighs the same as someone who is not athletic has a very different body. I honestly had a VERY hard time "seeing" my weight loss. I knew the scale was changing and my clothes were getting bigger, but it took a very long time to actually be able to tell that I lost 40 lbs. I can't imagine that losing a few more lbs visually would make that much of a difference - at least to me. Part of is those few pounds aren't necessarily coming from a specific area (waist, hips, etc). I took my measurements and found that I was losing weight around my arms, fingers too. Fat is stored in all kinds of places. Just don't beat yourself up over a couple of extra numbers.
The other thing is the running/racewalking. I'm slow...super-slow. You should be proud of the 10 min pace on your "bad days". I signed up for the HM that has a 15:00 min/mile max pace (All the others are 13:30) because I'm afraid I'm going to go over the 13:30 pace. When I ran my first 5k last year, I INSISTED that I run the entire time. You know what happened? The runners/racewalkers finished before me. I decided to throw my hangups about "running" the entire way out the window, and I am PROUDLY going to be running for 4 minutes, walking (slow) for 1 minute for my entire HM race. I'm proud of that, because I still know I'm going further than the couch potato I used to be.
Okay, sorry - I'll get off my soap box now.
I did my last training run Saturday. It's the inaugural race, so they don't have past pics or video and just posted the map on Friday night. So Saturday morning, I went out to run (most of) it. There is a one mile turn-around loop that I didn't do, but I ran 11 miles, and walked another mile to cool down. This week went much better than the week before. I was well fueled and well hydrated and I managed to get up super-early so a) it would be cooler and b) I could be at the race site around the time the race would start next week. My pace is just at 13:30, but I did stop to help a women who collapsed for a couple of minutes.
Right now, I'm feeling very prepared with the exception of having my race packet. I practiced my evening and morning routine (including breakfast) and the only thing that took longer than expected was locating one of dozens of sunscreen bottles in my apartment - which at 5:30am is hard to do while trying not to wake up my husband. I'll make sure to leave the sunscreen out, along with everything else, next Saturday night. 