Horrible smell

Recently I noticed a nasty smell coming, as I thought, from the bathroom. Then it was in the bedroom too, and try as I might, I couldn't find the source.
This week, to my utter horror and total embarrassment I've found that the smell is coming from me. When I'm not wearing a bra sweat from beneath my bosoms smells sickly sweet acidy, and pretty strong.
I looked on some medical websites and the general opinion was that it was caused either by uncontrolled diabetes ( mine's fine ), or using protein as an energy source instead of carbs. At the mo I'm on a low-fat, low-calorie diet, nothing drastic and my weight's coming off nicely (21lbs in 4 months), so I can't see it being that either. I also get some terrible night sweats too; two nights ago I seriously thought my hot water had leaked, it was so bad.
Has anyone got any information on this pungent perspiration please?

Sorry, that's 'hot water bottle' !

No, nothing like that there, Cocacola. I had a good look.

Hi Hobs, Netty and Anna. Thanks for the replies. I've not actually got a rash - it doesn't even go red, just really sweaty. I'm way past menopause, (boo, hiss! )having had a hysterectomy in my mid 30s, and I'm 60 now, so although most of the evil in the world is due to menopause, my sweating isn't.
I'm due an appointment soon with the consultant, so will ask her to check it out. I think you're all right, in that I'd better see someone about it. If it had turned out that it was pretty common after many years of having diabetes, I'd not bother, but I will. Thanks, all!

Thanks Anna - will do!