I would keep exercising and doing things that feel okay and which will help (how about hot showers?). It doesn't quite sound like fibro if you don't have pain when you're doing stuff.

Are you on any medications? Lots of medications and other conditions can cause aching. like you describe.

If your family doesn't "like" the word fibromyalgia, then don't use it :-) See if you can get them to agree to a regular, yearly physical (which everyone should get every few years) and then tell the doctor about your aches and pains and see what the doctor says.