Hi A.,
Yes, emotional and physical stress can be a big factor, because it not only affects how and whether you digest your food (stomach acid levels, assimilation of important micro-nutrients, movement of foods through your GI tract), it also affects WHAT you eat and drink--tendency to "quick fix" or comfort foods that are often high in fats and sugars, low in the nutrients we need to help with digestion and lowering stress...and THERE's your connection! If your body either isn't getting or can't assimilate nutrients that help DEAL with stress, then you become even MORE stressed, and the cycle continues.
That being said, while reducing your load and getting some exercise and watching your diet all must be done to reduce the overall stress, you now also have an internal physiological cycle that needs breaking. The symptoms you describe could be a number of things, and each could have a number of direct causes and specific things you can do to help:
Regular heartburn--may just be poor nutrition. Be sure you are taking a good probiotic supplement (yogurt is good IF it is a natural brand with high levels of live cultures, but it doesn't provide the complete spectrum of probiotics or enough potency to really deal with this) for now. You also may want to take a digestive enzyme supplement--especially if your diet is not high in raw fruits and vegetables (organic ones, which actually still have micronutrients in the soil where they are grown, as opposed to chemically grown, which is completely depleted soil).
--heartburn could also be a sign of a heart problem in women, or more likely, an acid reflux problem. You should probably get checked out by your doc to rule this out, but don't jump to acid reflux medication necessarily--you may be able to manage that often with nutrition and exercise. The fact that you say it has gotten better is a good sign for non-medical management.
Yeast infection: Assuming you've had one of these before, it's pretty likely you know exactly what you've got and it isn't some other type of infection. There are LOTS of things I've learned from midwifery training and my own pregnancies that you can do without the antibiotic ointments or internal antibiotics (which all kill off the GOOD bacteria in your system--those probiotics you need for the heartburn). My favorite no-meds treatment for yeast infection is this:
1) Avoid all sugars, sweetened juices, etc for awhile
2) Drink unsweetened cranberry juice--you can buy this concentrated and add water, and drink LOTS of water.
3) Alternate once per day--use a peeled garlic clove as a vaginal suppository in the morning, just pop it up there like a tampon, and then use a probiotic capsule the same way in the evening. I guarantee within a couple of days you'll be feeling much better! Keep doing it for 7 days, though.
There are other things you can try, but these are the ones that I've seen work over and over--and that have worked for me unfailingly even when antibiotics did not.
Fiora