I'm on a mainly vegan high carb low fat diet and heard it is unhealthy. I feel better&i'm trying to gain weight/muscle. Should I continue this diet?

Yes, as long as... Vegan diets when done properly are very healthy. High carb diets can lead to weight gain but that is what you are aiming for. Not all carbs are created equal. Minimize simple carbs (sugars, starches) and emphasize complex carbs. No need to avoid healthy fats like olive oil, coconut oil and nuts. Make sure you are getting enough protein. Supplement with B12 & D. See http://tinyurl.com/l9gtgjw.