I'll make Gregory's comment into an answer:

You don't owe anyone anything. Just announce that you'll be leaving as of X date so nobody gets caught by surprise.

The circumstances and details of you leaving and are your business and your business only.

You can give more details in a private setting to friends and colleagues you trust, but only as much as you feel comfortable giving - again, you don't owe anyone anything and they don't "have a right to know" anything beyond your last day with the company and maybe knowledge transfer.

Find another job and move on.

The other concerns can be addressed to HR during your exit interview (if there is such a practice in place), or another company defined communication channel.

I'll make Gregory's comment into an answer:

You don't owe anyone anything. Just announce that you'll be leaving as of X date so nobody gets caught by surprise.

The circumstances and details of you leaving are your business and your business only.

You can give more details in a private setting to friends and colleagues you trust, but only as much as you feel comfortable giving - again, you don't owe anyone anything and they don't "have a right to know" anything beyond your last day with the company and maybe knowledge transfer.

Find another job and move on.

The other concerns can be addressed to HR during your exit interview (if there is such a practice in place), or another company defined communication channel.