Hello there

I'm sorry it's taken so long to reply ...
Can I ask if you are a active person, or likes doing strenuios activities, such as sport or arobics? If you are a busy Mum, it's easy to overdo it, and not realised you may have strained something... if it is muscle related, a warm (not hot) bath may relax any aches n pains .... don't think hot baths help, cos all they do is inflame the muscle more...
You may have been having these all your life, as you've probably done any task you do too the limit .. ie carried 6 bags of shopping instead of 2 at a time, even overdoing any work or lifting ..like picking up all 3 kids, instead of one at a time..
I've noted you've consulted with your doctor, if you are still concered, seek a second opinion.

Take care - and don't overdo anything

Ginger