Meanwhile, do you think I should change my portfolio to be less aggressive? Miss Prim
Yes, I do; simply because your current positioning seems to be causing you to lose sleep. Whatever is "right" is not a single answer, but part of a unique answer for each person, that includes a lifetime blend of saving, spending, and experiences / achievements.
Reducing your projected growth may have some consequence you can foresee. Maybe it just means less inheritance for your kids. But you don't need to sacrifice now for things like that. Take care of yourself, make sure you aren't causing yourself ulcers, then do the most good you can for others.
If you are in your 70's, and are participants here, you can probably put enough in CD's or TIPs to fund yourself to your personal life expectancy, plus some. Anything more aggressive than that is for "want to haves," whether that is personal enjoyment, family, or charity. Putting it all into absolutely safe investments is extreme, but perhaps putting your core spending into such an arrangement (or, hold your boos, an immediate annuity) could put your mind at ease.