Acrophobia. All he will face this issue.

I understand ur difficulties. His fear of heights might have generalized to few other situations also. Sweating, palpitations, breathing difficulty are the bodily symptoms of anxiety. Anxiety makes a person lose his confidence, reduces his concentration and potential and dull his ability to think. V would need to know a few more details like ur sleep, frequency, other situations that might make u anxious etc to give appropriate suggestions. Dont worry, it's not ur fault. Anxiety occurs due to chemical imbalance in the brain. Ur problem can be easily treated with counselling and if needed medications. U will be able to function better with it. Don't let ur problems affect ur personal or professional help. U need to consult a psychiatrist. U can also consult me online through the Practo chat option. Best wishes for speedy recovery!!