Nursing and pregnant

Hi! I know this thread has gone around, but I am nursing and bc I am pregnant I literally feel like all my energy is zapped and I have no nutrients left over for me. I was nursing 5x a day and I have it down to 3x. How are you ladies doing? And how much  water are you drinking. I weigh 150 and drinking 100oz of water a day. Is that enough? Also, I am having on and off spotting, I am nearing 8 wks and have had an u/a and all was fine. Anyone else spotting while nursing? Trying to see if it's just this pregnancy or if there's a correlation. Thanks!