Re: Is self-love the greatest medicine?
I am not sure if this is the statement made by Budha, but I would not be surprised if he had.
In some way, yes.
I would not say, self-love is greatest medicine, but I would say that self-love is greatest trait, greatest quality a human can have (not that humans do, but humans can … only few lucky ones love themselves).
Well, self-love is not self-fish. That is obvious, as love is not fish. 
Well … self-love is most important trait, quality or character a human being can develop, as it is required to know Allah, become good human as well as good Muslim.
Self-love … do not mean self-praise or feeling of self-importance, neither self-love develops selfishness, greediness or enviousness. We should remember that one cannot love others if one do not love oneself.
Most important result of Self-love is desire and effort to know and recognise oneself.
Knowing and recognising oneself make one know and accept limit of oneself, acknowledge good and bad in oneself.
Once a person knows oneself, recognise and accept limit of oneself, and acknowledge good and bad in oneself, than only one can appreciate and accept limits in others and understand good and bad in others.
Actually, knowing oneself is the only way to know Allah and his creations, but unfortunately, most humans do not know themselves even when they think they do know themselves, hence could not know Allah.
It is obvious, as those who do not love themselves do not know themselves (even when they think they do know themselves).
Unfortunately, it is ignorance, arrogance, not accepting reality, hiding from truth, living in lies, ego, desire, greed, anger, envy, jealousy, feeling of self-importance, lack of will power, no concept of empathy, submission to pleasure … etc … limits a human ability to love themselves … and thus know themselves.
Well: That is a part of what I understand of the topic (and I hope I did not over written it). I hope what I wrote would help.
Note: I think many great scholars of Islam have also written that … to know Allah, one have to know oneself. …
And it is obvious that to know oneself, one have to love oneself, as it is love of oneself that makes a person try to know oneself … just like, when a person loves someone or something, one try to know everything about that someone or something.