Hi moshpa,

welcome here, I'm also quite new. I have 1 confirmed SPDer who's 6 and my elder daughter who's turning 3 on the 24th Apr ticks a lot of SPD boxes so we suspect she's probably a SPuDdy as well

My youngest doesn't seem to have as many of the quirks the other two showed early on, but with 3kids jumping around I think I may just have missed something, so I'm keeping an eye on it.

I'm also in web - more design than programming, but I'm not lucky enough to work from home...

Also love to read but don't get to much these days!

If I can recommend it, try look up sensory diet activities and search through OTplan.com for ideas of what you can do with your son so long. Pinterest also has some fantastic pins for sensory bins and activities.
Apart from that, try get some of the available books - the most widely recommended seems to be the Out of sync child, and Sensational Kids. There's also Sensory Integration and the Child by J Ayres, who's the OT who first theorised SPD as a stand-alone disorder.

I've found "Answers to questions teachers ask about sensory integration" to be a great starting point. It's been very helpful in helping us map certain behaviours to the sensory systems our son has the most difficulties with. If you are able to do that it will also help you in searching for things you can do with him with regards to a sensory diet or motor skills.

Other than that, it could be worth going to see your OT friend even if it's just to get an initial assessment / report that you can take to a local OT or to the GP and will give them professional confirmation of what your son needs help with. May save you some time in the long run.

Also maybe try the compression wear/weighted vest or blanket? My son often asks to listen to my music - I like very specific stuff, a lot of it choral / classical, and I think he could be instinctively trying to use music therapeutically as in Integrated Listening Therapy and other programmes. That could be worth looking into as well as I think a few of the programmes have home programmes?

All the best... hoping things go better than you expect!