I have had the pharmacy say the same thing to me many times. Usually it's the one that doesn't get any Lyme patients (big chain pharmacy in my area). The antibiotic doses need to be higher in Lyme. It's relatively safe and common for LLMD's to give more than one antibiotic at a time to combat the several different forms of Lyme along with co-infections. Using more than one helps to prevent resistance. You have Flagyl for the cystic form, azithromycin for the cell-wall deficient and I suppose cephalexin for the spirochete (although that one is less commonly used).
I have also been on cortisol. You are on a physiological dose likely to help your adrenals? This is different than a pharmacological dose which would be immune suppressive. It's safe to take that dose. 0.8 is VERY low. I was taking 10mg per day. Your own body (when healthy) produces the equivalent of about
30 mg of cortisol a day, so up to that amount is considered okay.
That being said, if you are uncomfortable with your treatment you should definitely talk to your LLMD and have him or her explain their rationale behind the meds. It can be very scary to take all these meds and I think sometimes doctors forget that people like to understand exactly why they are taking them and what the function is.