I've been diagnosed with estrogen dominance as well. A big contributor to the condition is poor liver function due to toxicity or blood stagnation. Chlorella helps to purify the liver and the blood, so the body overall should benefit, nor should it complicate estrogen dominance. Not having enough natural progesterone to balance the estrogen is the real issue.
I am curious as to who advised you to stop taking the chlorella? It is a food source, not a supplement, which contains all the essential amino acids, nutrients we would get from consuming vegetables in much higher concentrations. Actually, our food supply is nutrient deficient and it critical to find other complementary whole foods.