What you perceive as a rational concern is actually not. I just looked at another post you made and it comes across as completely irrational.

I can see the pulse in my neck, I can see the pulse in my 10 year old child's neck. When I was watching the tennis a few weeks ago I just so happened to see the pulse in one of the tennis players neck.

You are caught in an obsessive cycle of macro analysing physical 'symptoms' that are completely normal and further obsessively cross referencing them with closest fit health problems you can find on Google.

As long as you keep doing that, you WILL remain in a state of suffering and anxiety.