I just went natural and my hair is frizzing, thinning, and shrinking. I have gone to doctors and specialists, but nobody can tell me why. I do twist-outs a lot. Any ideas what could be going on?

You could be getting damage from constant twist-outs, and that could cause the thinning. Frizz is part of having natural hair and so is shrinkage (especially for the 4b and 4c gals, they have over 69% shrinkage). There's no need to go to a specialist, your hair is just adjusting to its natural texture. I'd recommend leaving your hair down for a week or so without manipulating, and then wearing a protective style such as Bantu knots (for two weeks, then leave it down for a few days). Make sure to cover your hair with a satin-lined cap when you wear Bantu knots.