First and foremost, stop worrying and start seeing the reality around you. Try to be stress free and do some light physical exercises everyday. Walking, jogging and swimming will do a world of good to you. Finally, you can take medicines containing herbs like ginseng, and ashwagandha. Just search the net and you will get all the details. Take a few walnuts, almonds and cashew nuts daily. Watermelon is also good for increasing your libido. Try these and do let me know. Take care.