K.A.
I am allergic to the penicillin family (has put me into shock) as well as sulfur based antibiotics and list of other drugs. I am also allergic to any of the -caine family of painkillers. Add to that breastfeeding as well. There are many options available. The doctor just needs to be willing to do their job, which I have sadly seen some that aren't willing.
In the past we've run into doctors that just won't move outside of their bubble for myself and my son who's also allergic to penicillin. You have to be proactive and assertive to get the doctors to look further than their "go to" options.
I have some good doctors now that have taken the time to find what I can safely take if I need anything.
There is nothing you can do to become less allergic to these types of medication and the reaction can and most likely will get worse the more you take it.