Acne, blemishes, and rashes on face

I am now 27 about to turn 28 in Feb. I had problems with my skin starting back at age 15.  I realized that I had very sensitive skin and used alot of Mary Kay products back then to clear it up.  My face went back to its normal state.  I've only had issues since then with my face after my first pregnancyat age 19 and now.  This is the worst it has ever been.  I have used Neutrogena, Lancome, and now have switched to some homemade facial remedies.  None are working. I consistently get pimples, that then leave very dark blemishes after using the face washes for oily skin. My skin is very dry, my eyes are constantly appear puffy dark and swollen.  I am misreable.  I want my skin to become normal and not dry, inflammed, and swollen.  Please help