I have two autistic DC and I'm autistic myself. Your little boy is very young and of course those things could just be his young age.
The reason why autism can be so hard to diagnose is that some of the traits can appear in a neurotypical child. But what tends to happen is that in a neurotypical child, they'll have one or two autistic traits, not all of them collectively.
No one can possibly tell you over the internet, but I saw your list and I think it absolutely warrants further intervention. From everything you've said in your OP and follow-up posts, I'd say there are lots of red flags.
I think you can self-refer to speech therapy for children? They don't tell you that though. Have a look in your area and find out if it's possible.
My DS was extremely loving, affectionate and huggy - and at 12 yrs old he still is. He is autistic and has dyspraxia. He didn't toe walk, just walked normally. He used to stare into my eyes. His twin sister is also autistic. He was diagnosed at age 3. She wasn't diagnosed until she was 10. Autism presents in many different ways as you probably know now.
Has anyone done the MCHAT test? You can administer it yourself to see if your DS falls into a high risk category for autism. If he does, you can go back to the HV or even better, your GP and ask for a paediatric referral now. Early diagnosis and intervention is considered to be really really important but it rarely happens without the parent pushing hard. Like a PP said, once you get a diagnosis there's not really any more help. But having a diagnosis gives you lots more clout with the school etc to get support. A diagnosis can open doorways. And also, speaking as someone who's autistic, the autistic brain just works differently. It's helpful for you to know whether your child is processing things differently.
I've added a link below to the MCHAT checklist - should be easy to work through. Autism Speaks also has a link to the checklist but they are a vile organisation which is generally hated by the autistic community so I try not to link to them wherever possible. Please do holler though if you need any help.
mchatscreen.com