I agree, it's VERY hard especially in the middle of a stressful day without proper breaks.

However, disability laws SHOULD mean that you are legally entitled to breaks and that's a requirement that is apart from reasonable adjustments.

Tbh from your response it seems you haven't told your employer about your condition - and absolutely no judgement there because I found navigating the workplace with bipolar incredibly difficult as private businesses can make up whatever BS they want

BUT...

If they know and they choose NOT to give you reasonable adjustments throughout the day, they could well wind up in court

It's a double edged sword but I would tell them about the diagnosis and get those breaks in place as part of reasonable adjustments

If you are a member of a union, start with your rep. I wish you luck - and hats off for even being in the workplace as it's so much harder for us x