Welcome to the Forum. Several comments before we get you your primary question:
1. The antibiotics you took are highly effective for STD and for the urinary tract bacteria which can cause urinary tract infections and complicating epididymitis.
2. The blood in your ejaculate is a process called hematospermia which is a descriptive term. When this occurs, it is often transient and when that is the case, there is usually no detectable cause. It tends to go away without complication or problem. I would not worry about it unless it recurs.
As far as the orgasm issue, as distinct from ejaculation, this is unusual and there is little explanation for it from an STD perspective. My advice would be to try the urology Forum on this site. Sorry I can't clarify things more- hope this helps. EWH