The Uncertainty Communicator

Help me explain diagnostic uncertainty to a patient.

The situation: [DESCRIBE THE UNCERTAINTY GENERICALLY]
Why I cannot be definitive: [REASON]
What the plan is: [SAFETY NETTING / WATCHFUL WAITING / FURTHER
INVESTIGATION]

Produce:
1. Words to explain uncertainty without destroying confidence
2. How to explain why more tests are not always better
3. How to describe safety netting so it is taken seriously
4. Specific "come back if" instructions phrased in patient language
5. How to respond if they ask "but what do you THINK it is?"
6. How to respond if they demand a scan or referral I do not
   think is indicated
7. What to document about this conversation

Give me actual sentences, not descriptions of an approach.