My DS was like this. I walked so much on mat leave pushing his buggy around and took so many buses to give him things to look at and keep him interested. He needed constant entertainment and stimulation, wouldn't play with toys on his own, and became totally distraught the moment he couldn't see me. By the end of the day I would be mentally subdividing the last hour before DH got home into 5 minute intervals to stop myself going mad. He would also get really upset whenever anyone except me or DH held him, so trips to see relatives became an e exercise in 24/7 entertaining the fractious baby and mollifying agitated grandparents who were desperate for a cuddle.
He also slept terribly, at one point waking 4-5 times a night for months and needing breastfeeding and varying degrees of co-sleeping to get him back down again. We paid for an expensive sleep consultant which helped a bit for a few months, but then he started nursery and the separation anxiety made everything fall apart again.
I was exhausted and frustrated and just done. And honestly one of the worst things was how other parents just did not get it. My NCT group thought I was bonkers when I mentioned the 5 minute intervals; and they nodded vaguely when I mentioned the totally broken sleep.
He's just turned 2 and things are much much better. I'm pretty sure he's not autistic. His eye contact is fine and his language is great. He speaks in sentences, expresses basic emotions, does loads of imaginative play, loves to play with other children, and is starting to be able to initiate play with others. Being able to tell us what he wants and be understood has made a big difference.
It started getting better shortly after he turned one but it was a very very gradual process. Being able to walk and do some basic baby sign helped a bit. And he was always very motivated to communicate. Night weaning improved sleep a lot. About 18 months my husband was still adamantly one and done, but is now open to the idea of having a second.
It's not all roses - he loathes having his teeth brushed and makes a big fuss about it quite frequently. He also has normal, age-appropriate tantrums about wanting a specific spoon / having something exactly how he wants it etc. And he still gets very upset about nursery drop off most days (after going 4 days a week for a year!!) - but is fine once he is there.
I feel so different. I actually enjoy my time with him rather than counting the minutes before I can get a break. I love taking him to the park, and cooking with him, and playing silly games. I feel like I like parenting him, rather than feeling like I am failing all the time. It's honestly night and day.