It's not enough for poor Yolanda Foster to suffer from chronic Lyme disease ... she revealed at last night's Global Lyme Alliance Gala in NYC that both her daughter, Bella, and son, Anwar, are also suffering "in silence" from the very same affliction. 

   Those are some pretty potent and horrifying ticks, y'all. 

   Foster says, "When my two youngest children, Bella and Anwar, were diagnosed with chronic Lyme disease in early 2012, watching my babies struggle in silence in order to support me in my journey, struck the deepest core of hopelessness inside of me." 

   In accepting an award at the gala, Yolanda continues, "This award is for Anwar and Bella. This is my token and my promise to you that I will not allow you to live a life of pain and suffering. I will walk to the end of the earth to find a cure so that you can live a healthy life that you deserve." 

   "No child should suffer the way that you do ... I thank you both for your extraordinary selflessness during this journey," she goes on. "Your unwavering love and compassion has kept me alive and fighting through the darkest days of my life."

   Yolanda's been candid about her battle with Lyme disease, sharing photos of treatments on her social media channels ... but we had no idea the suffering went this deep. 

   Take care of yourselves, guys. Yikes.