Signs that made you think your child also had ADHD in addition tk ASD?

Hi. Today I took my 3 year old with ASD and high anxiety who has recently been having blinking eye movements which really concern him and he comes to me and says "mama.. fix eyes". We took him to an ophthalmologist who said his eyes were fine. Then we took him to a neurologist and my son was constantly climibing, running around, touching, grabbing everything inside his office and didn't even sit for 1 minute. The doctor said "I also suspect ADHD in him because he looks quite inattentive and hyperactive". The blinking eye movements were actually tics that he has been having recently. EEG came out fine.

My son is pre-verbal but it is realky difficult to get his attention when you show him something. He also constabtly runs around, climbs furniture excessively, impulsive, very poor emotional regulation, throws stuff in anger. Very very low frustration tolerance. Perfectionist. Regular sensory integration OT makes it a lot better and calms him down completely but when it's stopped, he goes back to his old ways.

He also develops hyperfixations/special interests but gets bored of them after 2-3 months. He elopes (just wanders aimlessly) outside.

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What signs did you see in your toddler that made you suspect ADHD? At what age they got diagnosed?