28F, I’ve had sporadic stuttering since I was a child with some worse periods and other better ones. I haven’t been in your exact situation but clearly whatever you were sick with was extreme, as losing 50+ lbs is absolutely insane, hope you’re doing better. Such an illness puts extreme stress on the body physically AND mentally, so it’s not illogical that it would have worsened your stutter. Was it a virus that could have attacked your brain/neurons? Regardless, I would say to approach your stutter with the same approach we would try approach physio or rehab to re-build up our physical strength - practice every day and don’t go into it with the goal of going back to 100% all of sudden. Small slow progress everyday from speech therapy and other techniques will get you back to fluency. You got this