I agree with @Isaiah_40_31 about the IJV compression by the C1 processes & styloids, also your neck is very straight and has lost it’s lordotic curve which we see quite often, there are some exercises which can restore that in this discussion:
List of my favourite resources on YouTube to learn anatomy - General - Living with Eagle
Although it’s one of those tricky ones, as your head position could contribute to the compression, or it could be your body has adjusted over time to make more space for the veins, so if the exercises make your symptoms worse then don’t push it…
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