Sorry, I know this isn't what you want to hear, but you need to stop catastrophising and let the professionals do their job.
With very young children, it's often too difficult to tell what's ordinary behaviour, what's permanent behaviour and what's definitely different to the norm behaviour. Children develop at different rates and have very disparate skills at his age, so there aren't a huge amount of benchmarks to be guided by.
Barring any immediate diagnoses that are determined not so much by observation but by things like blood-tests, you may well be told to wait and observe and see what the next 3 or 6 months bring, and you may be told this several times. Or the waiting list to see a professional for your first and subsequent appointment could be months.
I do know how frustrating it can be when you want answers and it seems no-one will commit to let you know anything, but it's because they want to be absolutely sure.
It will be frustrating, but you do need to be prepared not to be given any immediate diagnoses and you need to learn how to deal with the frustration of that, so it doesn't impact the time you spend with your lovely son.
Learn to love him for who he is and don't spend your time together comparing him to everyone else's child, he's your wonderful son and he will be however he will be, just as other children will be however they will be.
Your job as his Mum is to love him unconditionally - I'm sure you already do
