Advice Burnout/Being Overwhelmed

Hello,

I've been referred to a specialist team for an autism diagnosis (it was one of those things that popped up every now and then but unfortunately was never pursued. Types of issues included not talking until age 4, difficulties with social interaction and reading body language, being overwhelmed by social situations and crowds, meltdowns,etc.) Because I have bipolar, anxiety etc it was assumed these issues were related to that.

Unfortunately, the waitlist is going to take a long time and part of the reason I went to the GP is that I think I have autistic burnout? Everything is overhwhelming, noises are like electricity, I can't handle social interaction, and my anxiety/ocd is out of control to name a few things. Basically, I'm in a limbo where I haven't had an official diagnosis yet but I'm struggling to have normality. I've been trying to push myself through things like I do with depression (i.e.make myself go to a busy shop) but that's just making me shut down more. I've reached out to a support group but it's possible that I will have to wait for the official diagnosis.

All of this is overwhelming and I just want answers so I can start to cope. If this is autistic burnout, what do I do to start being functional again? Is there any advice or tips people would recommend?

Thank you for your time, I really appreciate it.