Trouble breastfeeding

I am holding back tears I feel like I failed I had my baby through csection alittle over two weeks ago and started breastfeeding strong I got to the point o making two ounces and felt so proud of myself but then I got a kidney infection and now I am taking antibiotics and also took OxyContin for a couple of days due to pain I didn’t breastfeed for two days but decided to try to pump and dump I also needed a cat scan and they told me I couldn’t breastfeed for two days, once those two days were up I started trying to breastfeed not just formula and now I can’t really make any anymore I’m lucky if I get an ounce or half an ounce I feel like a failure I started out so strong but then I got sick and I feel so depressed about it I can’t make anymore milk