Yes, I was the same, and I thought it was for no apparent reason. To give an example, I'd have a friend at my place, and we'd have a lot of fun playing for example computer games together, until the morning after where I wake up grumpy and don't feel like socialising at all. All I wanted to be, was alone on my own. I thought it was BPD as it fitted the bifurcation black/white thinking and I self-diagnosed as such until I figured many years later that the reason why it is occurring was that I suffer from autism, and this is a sign of overstimulation.

I ran around for more than 20 years, pretty much non-functioning. I searched for help various times, and received help, but not always in my own best interest (e.g. if organisation X pays for your professional help, its in their interest; not yours). Now that I know I suffer from autism I have a much easier time recognising the patterns, and once my therapy starts I'll have an easier time coping with myself and society.

It makes me wonder how many people are running around with incomplete or inaccurate diagnoses.