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Heather Rae El Moussa<\/strong><\/a> thought she was dealing with \u201cmom brain\u201d four months after giving birth \u2014 but the symptoms turned out to be an autoimmune disorder.<\/p>\n \u201cI remember saying to my assistant, \u2018I feel like I\u2019m dead,\u2019\u201d El Moussa, 36, said in an interview with TODAY.com<\/a> published on Thursday, October 26. \u201cMy brain was so tired. My body was so tired. I was exhausted all the time and no amount of sleep could make it better.\u201d\n<\/p>\n Heather Rae and husband Tarek El Moussa<\/strong><\/a> welcomed their first child<\/a> together, son Tristan<\/a>, in January. Tarek, 42, is also the father of Taylor, 13, and Brayden, 8,<\/a> whom he shares with his ex-wife, Christina Hall<\/strong><\/a>.<\/p>\n After Heather Rae and Tarek welcomed Tristan, now 9 months, she returned to work to film her respective reality shows, Selling Sunset<\/em><\/a> and The Flipping El Moussas<\/em>. However, the experience felt \u201cbrutal\u201d because she could \u201cbarely get out of bed.\u201d<\/p>\n \u201cI was like, I\u2019m probably just foggy because of mom brain,\u2019\u201d Heather Rae recalled.<\/p>\n As she continued to deal with fatigue, Heather Rae also noticed there were inconsistencies with her milk supply<\/a> while being four months postpartum. One day, she would pump at least 6 ounces of milk before barely pumping half an ounce the next. After consulting with a lactation consultant, the real estate mogul decided to get some bloodwork done.<\/p>\n Her doctor told her that her pregnancy had triggered Hashimoto\u2019s disease, which was also the cause of her depleting breast milk. Hashimoto\u2019s disease is an autoimmune disorder that affects the thyroid gland, per the Mayo Clinic<\/a>. Symptoms of the condition include fatigue, muscle aches, joint pain, problems with memory or concentration and more.<\/p>\n \u201cWhen [my doctor] told me what I had, I was in total shock,\u201d Heather Rae told the outlet.<\/p>\n After receiving her diagnosis, she was prescribed medication to treat the illness and has been \u201cfeeling much better\u201d since seeking treatment.<\/p>\n