Heartburn is caused by frequency of eating, portion size, pregnancy hormones that slow the digestive system, & also later in pregnancy, the positioning of your baby & the pressure being applied to the stomach due to baby needing more space.
Tums Smoothies are the best. I've had indigestion since before 10 weeks and continue to have it pretty much daily. And yes, the hair is a wives tail b/c I had the same with my first two and they didn't have a lot of hair, just a normal amount for a newborn.
I'm 14 weeks and have occasional heartburn. I take generic zantac and that usually takes care of it.