so why haven't the drug Co's made a better drug? 
Wait.  I don't understand the question.  
Are you asking why a for-profit corporation, whose only purpose of existence is to generate maximum possible profit for its stockholders, would attempt to reformulate a commonly prescribed drug that quickly becomes addictive and is very hard to stop; to voluntarily seek to remove those highly profitable properties?  
Or were you joking?
Those are really bad meds.  I think doctors proscribe them much too easily.  I would view them only last resort option.  Only if you had an actual chemical imbalance, or were in such a deep crisis state that it was a safety issue.  I've had doctors offer a script before I can even finish my first sentence.  
Regular strenuous exercise has actually been shown to produce results comparable to SSRI's.  The down side it usually takes a lot longer for the effects to accumulate. Weeks possibly; but without the serious downside risks.  yeah, I know, I have difficulty finding the time too.
Last couple of years I've gotten heavy into meditation.  That can be helpful if taken seriously.  But again, its not a quick fix and can take months to turn things around.
(Aside: this is a fun watch 
https://www.youtube.com/watch?v=r8fcqrNO7so)
The bad news is; life is a beotch.  The good news is; it will be over sooner than you think.  

-Wab