I HAVE A MALE 11 YO CAT. HES THE LOVE OF MY LIFE. LAST NOVEMBER (2016) HE WAS AT DEATHS DOOR. BETWEEN THEN N NOW IVE GOT HIS INSULIN (PROZINC) AT 6 UNITS EVERY 12 HOURS. I AM UNABLE TP CONTINE PAYING THE EXTREME COST FOR PROZINC AS WELL AS THE NUMEROUS VET VISITS I.E. NO VISIT NO INSULIN. IS THERE AN OVER THE COUNTER INSULIN THAT IS COMPARABLE TO USE I AM UNWILLING TO GO THE ALTERNATIVE MEANING WELL U KNOW BUT NEED HELP. WHAT DO I DO? OH HIS INSULIN IS 40 UNIT INSULIN