Sorry to hear about your diarrhea. Have you had your gallbladder out, by any chance? Sometimes a malfunctioning gallbladder can cause yellow diarrhea. But the only way to check for a bad gallbladder is to see a GI and get an ultrasound and/or HIDA scan (which tests your GB's ejection fraction, or how a percentage of how much bile it ejects into the intestine).
Then again, it could just be "nervous diarrhea," as some members have mentioned. You never know what color that could be (I've seen yellow, green, red, all colors of the rainbow; color sometimes isn't the best indicator of anything "wrong" because it may not indicate anything at all, except for what you've eaten). If you're under additional stress lately, the added worry may be the culprit. That's great that you are eating "good" foods like skinless chicken and veggies, etc. Keep that up!
If I were you, I'd keep a food diary for the next couple of weeks, try not to look into the toilet too much (I know, I know - it's so pretty, it can be difficult not to stare ), take some nice walks...keep taking care of yourself. See what happens. If it resolves, you can probably bet that it's just the stress. If it keeps up for another couple of weeks, it might be time to visit your PCP at least.
Let us know how it goes!