If you can find a physician who would prescribe a estrogen progesterone combination similar to that used in menopause, that might help. Stress can cause anything I've learned over the years, and it is extremely stressful caring for a pre-toddler without your symptoms but must be very difficult considering the fatigue. I would recommend lots of sunlight, an extremely good diet rich in B vitamins and even an extra B6 supplement, and an exercise program. See if you cannot get a mother's helper to play with the baby while you read a book, soak in the tub or start a hobby. Plan a get away once a month with your husband.
Play groups are a good thing to establish or join also.
After a few months, the parents sometimes do exchange programs for overnights if no grandparents are close by. Chronic fatigue syndrome is another consideration here. Change care providers if you must to get the required help. I wish you success in dealing with this. Watch this report about showing affection to boys.