Stress comes from incompletions.
When something is incomplete, it is unresolved. It means there is a open loop that has not been closed.
Types of incompletions could be:
- unclear commitments,
- worries, complaints, problems,
- unclear direction,
- lack of acknowledgement,
- missing or hard to find information,
- unfinished blog post.
How these things exist for you determines your level of stress or feeling of being overwhelmed. It depends entirely on your perception of these incompletions. The same exact incompletion may not bother one person, but could throw another person into a panic.