I fell so sory for you, Sas; after all you went through with Graemer & Gabe...
I realise now how lucky I am with my 2 cats There NEVER was a fight at all; just a tiny bit of hissing, and five minutes later, they were grooming each other!!
I do not know about any medicine, but lots of us have, so I wish you all the luck you need with this!!

{{{hugs}}}