Taking pills or food wont help much. Sex drive doesnot work in that way. Its one's own libido, own urge that leads to a good sex. Your effort to take her to a doctor is good, some counselling can help, but ultimately its two persons wish to have a great sexlife. As its said, sex is not on genitals, its much more on the head. If she is stressed, the body wont help much.
On a family a man is supposed to earn, the wife runs the family. She looks after everything which you cant put a value on money. If the same wife has to work and earn money too, what you are expecting out of her? At least she lets you have sex and dont come with excuse like headache, isnot that enough?
Be happy with whay you are having now, if you want her like before, let her concentrate on home more and leave the job, I dont know why she should give up her career for a good fuck at night. Marriage is a compromise, not a sacrifice. Try to compromise with the situation, afterall she is bringing bread to the family.
So, you said you go married at 22 due to family problem, what was that problem?