A few things.
I'll start by explaining how I got a rid of it. I won't drag it out because it was a simple, but long process.
All I did was eat healthy and exercise.
I think around Jan 2012, I was already eating healthy for about a year, and didn't start exercising until around Dec 2011. So, by the end of my first College semester (April 2012) it was gone.
Fast forward to Summer of 2013, I was still working out, but for about 1 and 1/2 to 2 hours everyday, however, I was eating unhealthily again under thought that if I work out for that long everyday it wouldn't matter. I was even eating at McDonald's again. I was only getting strawberry smoothies, but it was everyday, and I didn't realize there was 60 grams of Sugar in it (and that's just in a size small).
Also, I had a few drinks over the summer while at my cousins wedding.I still wasn't having problems yet though.
During the start of this past College semester (August 2013) I was still good, no reactions from anyone, all laughs whatnot. Then around the end of September/ middle of October, the reactions and comments started up again.
During September, there would occasionally be a random fart smell (that I can smell) that would spawn from out of nowhere for about 30 seconds. Someone would say, who farted, then it'd be gone.
Around the middle of September, my sister had a party at her school and she made a bunch of cupcakes. However, a bunch of other girls also brought cupcakes, so she came home with most of the ones she made. For some stupid reason, I was just eating these things for breakfast, lunch and dinner for like a week.
I would say about a few days after that is when the problem started back full force. Meaning, it occurred all the time (or atleast when I was not at home), I could not smell it, yet everyone else could.
Since then, I've gotten it back down to where the smell spawns for a few minutes-seconds, along with me being able to smell it.
Specifically, what do I think caused it to come back? I think it was the diet. I think somewhere along the line I f***ed up my digestive system. Nearly everything I eat gives me uncontrollable gas. My diet as of now is as follows.
7+ cups of water/day,
Lemon/Orange/Peach/Ginger/Dandelion herbal teas
gluten-free oatmeal (I mix this with the granola below)
gluten-free cream of rice
gluten-free granola (with blueberries, amaranth, millet, quinoa, flax seeds, and buckwheat)
ground flaxseeds (I mix this with smoothies)
bananas, strawberries, cranberries
carrots, lettuce, cabbage/broccoli (I think I might need to cut this in order to properly follow a low fodmap diet), kale/spinach
gluten free thin rice crisps (I eat this with peanut butter)
gluten free peanut butter (I'm speculating that I should not be eating this. I experimented today and yesterday, and realized that every time I eat this I get gas, whether it's gluten free or not. Even more so, I recall when I got a new job in August I would always have peanuts before, during and after work and would always have gas. This is also around the time the random fart smells started to appear.)
No vitamins, no probiotics (I've wasted too much money on these for them to produce no results at all).
I hope that helps. If you have anymore questions, feel free to ask.