TLDR: Is it normal to feel like you've hit a wall halfway through the process of seeking a diagnosis? 

For the past year I've been working with my family doctor to try to sort out my mental health. I've lived with depression (diagnosed) and suspect generalized anxiety, social anxiety, and potentially OCD, Autism, and/or ADHD. Family doctors are few and far between here and he's been less than thorough so I asked for a referral to a psychiatrist. He agreed and after a few months on a wait-list, in August I got into a clinic that offers diagnosing through a set number of appointments.

The psychiatrist, who's great, suspects GAD, depression, social anxiety, OCD and potentially autism (though she can't diagnose autism due to it not being covered by the public health care system where I live). There's a lot of overlap with symptoms so it has been hard to untangle. I'm heading to a second follow up tomorrow and feel really overwhelmed. Part of me feels like giving up on it all because it just feels like I'm filled with so much doubt about what it is I'm navigating. I think I've burned myself out with this process. Part of me feels like I'm making my symptoms up too, which is so hard to unpack.

It's now become something I'm fixating on and can't stop cycling through thought loops, trying to a finite answers, reading about mental illness, envisioning worst case scenarios, and feeling stuck on 'what ifs' if I end up misdiagnosed. I'm worried I'm going to come out of this feeling invalidated and more confused than I did going in to it.

In seeking a diagnosis, I was hoping to find ways to make my life more liveable through a combo of therapy, meds, and accommodations. 

Has anyone dealt with feelings like this? Does it get better? Has diagnosis been helpful for you?