Try meditating everyday for atleast 15mins, try taking control over your thoughts. For the sexual problem, please try contacting a sexologist.
For the problem related to your marriage, I would suggest you to talk to your wife and things are gonna resolve as she understands that.
Also this happens when you are new to a marriage plus you guys are too young, so I think, with time, things are gonna resolve.
Health Tips
try learning breathing techniques