Hello ladies my ds is 5wks my breast milk is dy...

Hello ladies my ds is 5wks my breast milk is dying and I really don't want to use formula at this stage. I did go to the dr and was given a script to increase the milk supply but 2 days into it I had to stop as it gave my ds the runs Bigtime to the point that his bottom was red raw and not good at all... I have done all that I can to increase it but just wondering if anyone out there has used or done anything naturally that has worked as I said I don't want to give up... Thanks in advance