You can use Mederma, but please have realistic expectations. I've never seen anything great from Mederma, particularly with old acne scarring. So it's fine to use, but just don't expect much.
40mg is a pretty standard, lower dosage, so you shouldn't have any extreme side effects. Heart fluttering or palpitations should be checked by a cardiologist, but would be unrelated to the Accutane.
You don't want to take Vitamin A because Accutane is a derivative of Vitamin A. A regular multivitamin is fine. You also don't want to take anything else that will make you sun sensitive, like niacin. Regular multivitamins are fine and what I recommend. You can absolutely do Botox and fillers;...