Another voice here saying that your Employee Assistance Programme is a good step to take. If you were to contact them and explain that you are experiencing challenges at work related to your mental health condition, but you don’t know enough about what reasonable adjustments might be made to know what to ask for to help, they should be able to refer you on.
The other thing I would do is try to do some of your own research about what might help, put together a proposal for you manager and ask if you can try something new to see if that works. Document everything so there is a trail showing your discussions and what is agreed. If they won’t refer you, try to come up with some ideas - what do you need from them?
As an example, someone I manage suffers from anxiety which they take medication for. We have partially returned to the office and I noticed that this employee was often late and was struggling to engage with some tasks, missed a few deadlines etc, I asked her what was happening as it was unlike her, and she revealed that she was finding it very difficult to use public transport at rush hour after Covid, and that her anxiety was becoming overwhelming- we agreed to change the times that she needed to be in the office so she comes in later, and finishes later to avoid the busy times. That has worked for her and her productivity has increased.
Other adjustments I’ve seen in the workplace to support employees with disabilities or mental or physical health conditions: reduced hours, reduced work load, redistribution of ‘high stress’ projects or clients for a short time or permanently, borrowed admin support (support from managers PA for a few hours a week), support to prioritise work load, mind mapping software, changing seats in the office, working in a quiet room, home working, moving teams, new managers….. any of those worth a try?
Writing a clear communication after every meeting with your manager is key too - always referencing your disability and what was agreed. I.e.
Dear Steve
Thanks for the meeting today - it was good to update you on my mental health condition and the fact that I’m feeling xxxxxx at the moment. I do feel I need additional support to manage my condition as I’m conscious that it may start to impact on my work. I know that you said that a referral to occupational health wasn’t appropriate at this time - but I wonder if we could consider xxxx to see if that makes it easier for my to perform at the high standard that you have come to expect from me,
(Or something like that…)