Thanks for the response.
My Neurologist told me that most of cases occur heavy-set individuals that I am NOT. I am always mid-range weight, never had any weight gain except in my pregnancy. However, it seems to me that weight doesn't matter.
One thing of which I can think is that as stated in my previous post, it happened after heavy-snow shavelling. Then, in the beginning I thought I twisted accidently my left leg in order to lift a heavy-snowfall.
In my family, there is no-one sufferring this, excruciating pain that doesn't happen often, but once the pain starting, it's getting REALLY painful which I can not describe in plain language. It's sort of going to kill me due to the pain.
Since I was on two meds., it's getting much better. At least, there is NO painful episodes whatsoever, for that I'm very thanksful. I never experienced the pain when standing, ... only lying down in the bed. Just wonder why the pain only when lying down?
Then, I'm very cautious about moving my left leg when I'm in the bed.
As to meds., on my first visit, my Neurologist rx'ed Cymbalta, however I didn't like it. On my second visit, he rx'ed Gabapentin 100 mg. saying it's less side-effect that is true to me, except a bit sleepy after taking it. Another med. Skelaxin 800 mg. was rx'ed after my excruciating pain that occured about six-months after taking Gabapentin 100mg. Then, in my guess, Gabapentin 100 mg. brought up my 'real' issue, 'Pain,' as hearing/reading that it often happens if there is underlined issue that applys any illness, particularly on mental illness whose symptoms started to appear after taking anti-depressant on Bipolarity.
My Neurologist made me appt. in six-months, as saying there is no significant issue as long as taking two meds. on daily basis.
Thanks again for the knowledgeable and helpful responses.