Been advised by my doctor I shouldn’t fast while taking taking adhd meds?

Salam,

I’ve been taking adhd meds for a while now. I’ve been told by doctor that due to the nature of my job, and dehydration possible liver damage as a result of lack of water, to consider just fasting weekends.

The job I do is high risk and deal with needles all day and it’s a very busy job. I’ve been fasting over the weekend and noticed I genuinely can’t fast without my meds as I can’t focus on my salah, or reading Quran.

I can’t help but feel guilty as I haven’t tasted all last week except weekends. Could I possibly be committing a sin here? I don’t know what to think or do.

My medication is long acting however it wouldn’t last me most of my shift as I need to do top ups and drink water.

What is everyone else doing, and are we really exempt? My first thought was to seek medical advise but despite having done that, I feel guilty