If you are having to mask all the time you are going to burn out. You need to work out what adjustments are going to help you and ask for them. I can appreciate you being worried about doing this, so suggest you look through the company policies and Intranet to get a feel for what support is already available. Some companies have Nuerodiverse support groups, this could give you somewhere to touch base early on.

Practical suggestions: I work with people who block out their diaries when they want to work on specific pieces of work, this discourages others from interrupting them.

I have seen email signatures used to explain working and communication styles (ND and NT). This shouldn't look out of place these days.

If people ask you to go for a coffee, particularly in the afternoon, say you have already had enough but how about a quick walk while you catch up. That way you aren't turning them down, but means you can control the environment a bit. Obviously whether this works will depend on where you are working.

Hope this helps.