Suppository boric acid making me dizzy and feel sick?

I started using a boric acid capsule my dr prescribed for me. I’ve used a different kind in the past (not capsule) with no issues that I remember. This time however every time I take it I get dizzy and feel sick/toxic feeling. (yes I’m taking them vaginally). Is this common or normal? I thought maybe coincidence but it’s happened a couple times. I see very little information online about it. Could it be absorbed through a cut or something or just a die off reaction? My dr takes several days to respond so thought I would ask everyone else experience?