hello there margobambino. I just wanted to come and say hi and post - quickly sorry as it is getting late. you sound so down and anxious about your ds. please call your HV again tomorrow and also your GP for yourself. don't give up if they don't call you back, please keep trying.
I also wanted to let you know that my ds is 22 months and has similar traits to your ds, and my view is that he is completely normal.
My ds walks on tiptoes - sometimes - he is discovering balance and trying to learn how to hop, skip and jump, how his legs work and how to co-ordinate his body.
My ds is totally obsessed with saucepans, as part of a general obsession with toy kitchens. I admit this has had me worried in the past but it is clear that he simply loves getting out pans, putting them on the hob of his kitchen, opening and closing doors, arranging things (like the earlier poster mentioned about lining up cars). I am happy that it is not a problem because he will also engage in pretend play, so cooking his toy vegetables, making me a cup of tea etc. I would let your ds explore his tea set, how it works, what the lids do etc and he will most likely progress onto "tea making" if you sit with him and a teddy bear or doll and make pretend tea, pour in pretend milk, hand round pretend cakes etc. He may be picking up on your worries about the spinning and starting to think that it is a bad thing to do and that he will be in trouble or that you will be upset. Also you say your parents stopped him spinning so he is learning that it is a "bad" thing from them. Also you bought him a new toy and then took it away from him piece by piece - any child this age will cry about that.
Lights - again my ds simply loves lights. He points them out in books, adores shouting out the colours of traffic lights when we're out in the car or walking by a main road, likes to turn on the lights for me and point them out. My belief is that this is normal - he is building his language and understanding and is keen to share his enthusiasms! Your ds may be "worried" or intrigued by non-working lights if he is keen on lights and bulbs, hence need to show you.
I would echo what others here have already said that you need to worry a little less about your ds and look after yourself and talk to someone about your worries.
I hope this helps just a little.