If most pilots were 100% honest, they'd admit to feeling's like this at some stage in their career.
I used to get a bit shaky when I looked out and viewed the wheel of a C172, over all that space. After all, being very high in a collection of rivet's can be unnerving.
It get's better with experience, but can still catch you out after time.
If it's ongoing and disabling, try a look at online CBT programmes such as the Mood Gym. As someone who prides himself from sorting the wheat from the chaff, this sort of stuff does seem to work.
The usual warning, if it's unremitting or has an effect on how you control your aircraft, then talk to your AME.