Hi,
This is Dr Kishore.
I just came across your problem and there are various causes for mood swings and difficulty focussing.
These symptoms are very common in professional individuals and they usually doesnot mean any illness.
Each person is different and your friend being diagnosed as ADD, doesnot imply that you might have a similar problem.
Next Steps
You can contact me online via Practo so that we discuss your problems/issues furthur in detail and arrive at a solution that best suits you.
All the best.