I work for a it company, high pressure job. i start my day by 10 am and close it by 7 pm. by the time i reach home, am completely tired and exhausted?

Improper posture: You are straining your back and neck due to bad posture while using your computerts. Make sure you maintain a good posture while working.. Begin your day with streching exercises. Accomodations like using an ergonomic key board , work station and adjusting the height of your chair and desk will make a significant difference .Take frequent short breaks for stretching and relaxation exercises.

Sounds like stress: It sounds like stress from your work is the cause. Are you concerned it may be some medical reason? If so, you can have your doctor do a basic checkup, evaluating for things like diabetes or thyroid issues.