While those of us with autism could post solutions/suggestions... they won't necessarily help/be useful because we're really all very different, just as NT people are.
I do manage to work full time in a professional role. However, (likely down to the field I'm in) I have, with one exception, always had a manager that understands me and my difficulties and can accommodate them. This is likely because I can (quite surprisingly) communicate clearly (about work things anyway), my productivity is v high, I'm exceptionally flexible in terms of time (e.g. will work until midnight at the drop of a hat, having started at 8), am utterly meticulous in my work, I just don't make mistakes, I learn super-quickly and pick up anything that's needed. I'm an AI in a flesh body (in fact my family call me 7of9) but that's rather useful in what we do.
So I need a quieter space to work, preferably alone, also need to be warm. That's actually doable for many employers. I have shared offices previously, but I do need to not interact with others for chunks of time, so I had a (laminated!) red "Do not disturb" sign. I also wear headphones (not necessarily with music playing) to keep interactions down.
I did once have a manager that didn't get me. It was four months from him starting to me leaving, because he made me work every part of my three months notice twat.
I could not work for him.
Thankfully my leap took me elsewhere, to another manager who really gets me, and I absolutely love my job.
But they do need to know what you need to function. Is there some way you can express what you need to your manager or HR, without necessarily discussing your diagnosis, just in terms of 'comfort', concentration, stress levels etc? It's normal in a new role to have reviews of the situation and say what is working or isn't working. The employee is allowed to review the employer too 
I do hope you can broach the subject with them, it could really change things for you.
Good luck!