When are duas accepted?

Q:

  1. Are Duas accepted yes or no - my answer would be 1) Its answered now 2) It may be answered in future 3) You will get it answered in Hereafter. 
  2. What about statements (ahadeeth) ALLAH has forgiven and made you enter jannah and saved you from Hell.  Its like Jesus pbuh dying on cross or something a little like that.  

Sleeping incorrectly

Q: When I sleep, I become paralysed and I can't move my body. I feel like something is pressing on me. Some say it is some scientific thing but I know it is a jinn because the moment he releases me, I read some verses and release it in the air and it stops. What can I do to kill it?

Hair transplant

Q: I am a 25 year old male that is experiencing hair loss. I have tried shampoos, creams, tablets as well as hair lazer therapy in order to stimulate hair growth. However none so far has given the desired effect. The other option I am aware of is hair transplant. With the hair transplant there are 2 routes that I can choose. The first option, they take my own hair and transplant it to the areas with less hair, however at my age I have been advised not to go with it. The second option is a Fibre synthetic material which is not human hair which can be transplanted via a non surgical method. My question is, would it be permissable to go with the second option: Fibre synthetic material?