Here is the dilemma with MAC - One can try rigorous alternative treatment and it may work. Or it may not and you need to progress to antibiotics. It is always important to discuss with your doctors why it is important to initiate treatment when they recommend it.
You said "...I was diagnosed about a year ago for MAC and avoided treatment..." The alternative to medication is not to just wait, but to adopt a lifestyle of airway clearance and other strategies.
Here is an excellent article that describes the options:
https://www.sciencedirect.com/science/article/pii/S0929664620302035
If you need antibiotic treatment, it is okay to be worried, but remember, many of us here have taken them successfully, and are here to encourage you and help you manage the side effects.

What have you been doing to try to heal your lungs without the medication?
Sue