Ah I HATE bad scale days!!! It's so disheartening and makes you feel like its wasted efforts.
I got weighed on Monday at 238 and then the next day it was saying I was 241 I wanted to scream, but finally now it's saying I'm around 237.5. But I've learnt to take my weigh-ins during the week with a pinch of salt and not take them to heart, the only ones I care about are on Monday. I guess weight can just fluctuate during the week, it's good you went on the walk to clear your mind - it does you SO much good! Plus you're going to reach your goal regardless, just stay on the exercise bandwagon and keep up everything that you've been doing right to make you lose each and every one of those 37 lbs!!
xx