When my 2 yo had her 2 year check, the HV was concerned about her speech, eating and lack of growth and asked to see her again 3 months later. At that appointment she said she'd been concerned about ASD at the 2 year check, but because she'd seen DD point out a colour to me and give me a plastic cake at the subsequent appointment, she was no longer concerned 
I've asked for a second opinion and told my friend this (when asked how it went) today. She said in no uncertain terms that I'm being a drama queen and wasting NHS resources because one professionals opinion is adequate. However, I think my concerns warrant further investigation and that I'd be letting DD down if I just left it. Some concerns I have are:
She has never had more than three words anyone could recognise. The words she does have are never retained. Mummy was her first one but she can't say it anymore
She'll learn a new one every few months and though it's repeatedly every day, she'll one day no longer be able to say it.
She has a very restricted diet of four foods in the same form. She won't try anything new and some days barely eats.
She struggles in social situations - she hates the prospect of unwanted touching and would rather fall down the stairs than even someone well known to her pick her up or touch her. If someone blocks her way or unexpectedly touches her it makes her distraught to the point of having to leave places. For example, we went to an adventure playground a few months ago and as she was about to use the slide another child started climbing up it. She was screaming and flapping and the other child squeezed past her at the top. I took DD off and she was inconsolable to the point of having to go home. We went back at the weekend but when we got to that slide she remembered what happened before and got extremely upset again.
There are other concerns, but these are my main ones. Of course they could be normal toddler things, and I hope they are, but then again they might not be. I was feeling justified in asking for a second opinion until speaking to my friend today but now I'm doubting myself. What do you think, AIBU?