First, I'm glad you're here and dealing with your new reality, even if its diagnosis is still in the future. You're a young mom who needs to be healthy and strong. I'm guessing you are resilient, and have your youth working for you. 😀

POTS is a distinct possibility, but so are other potential conditions, including a heart arrhythmia. Maybe an electrolyte imbalance, maybe an autonomic disorder, perhaps an endocrine disorder. It may even stem from between your ears, if you follow. You may have some emotional or historic matters that are clawing their way toward your conscious self that you'll have to face soon...just a wild guess, but please keep an open mind to all of these possibilities so you are not shocked by them. My counsel is that you persevere, but with a great deal of patience. For now, spend some energy getting help, but especially of the domestic kind so that you don't worry yourself sick over your motherly obligations. Reach out and enlist the help of others and make it clear it may not be short-lived.