It could be the result of many different things, and I don't know what it is. Do you see a doctor for meds, or did you? Maybe you could ask them. I take lexapro and don't have that problem. I do have trouble with word recall when I am talking faster than my mind wants, or I feel pressured to talk faster in conversation than my mind is comfortable going. I don't know if that's from lexapro / antidepressants, though.
Just wondering how old you are? Could it be age related? Regardless, I'd get checked by a doctor.
Glad you're feeling better!