Oh Steph! I really wouldn't worry too much about this at all. Considering how much stress your body was under for the dental stuff and the colonscopy and how screwed up your eating was consequently -- everyone's body responds differently to stresses. Your body is pretty smart - it's not letting you starve or waste away during this period of stress. It was probably in some sort of coping mode - i.e. you weren't getting hungry because it knew that food wasn't going to be good for it right now, and as a result it was holding on to all the calories and fat it could at an increased rate to help you get through the week.
In other words, a week when you have two major health issues/tests going on and when your eating is all out of whack is probably not the best week to use as a 'test' week for the speed of your metabolism! Just get back to eating normally/healthy etc. and you should be fine It's not terribly surprising the way your weight is jumping up and down since you've been through so many changes in diet (understandably!) - and it's certainly not surprising that we start gaining weight when we stop eating just rice all day (been there!)
How much weight do you need to lose by August 9th? There are some extreme diet plans I could point you to that aren't the healthiest thing in the world but probably wouldn't kill you for 2 or 3 weeks. Might be difficult to make IBS safe though
Remember too that the best way to increase your metabolic rate is increasing your muscle mass = weight training!
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Re: Metabolism Question
It's not terribly surprising the way your weight is jumping up and down since you've been through so many changes in diet (understandably!) - and it's certainly not surprising that we start gaining weight when we stop eating just rice all day 
(been there!) 
