Please forgive me if I sound dumb for asking

and this is what contractions or BH contractions feel like but this is my 1st so I'm totally clueless. Long story short, one of my friends at work with has been out for 3 weeks due to a loss in her family and it will probably 6 weeks or more before she comes back so I got 'volunteered' to do some of her work while she's out. Her supervisor asked me if I would do some filing my friend was behind on so I said sure thinking it was just a little pile, no it was like a foot tall stack of papers that had been there for 2 months. But not a big deal right, it's just filing. Well I don't know which hurt worse standing up forever doing the top 2 drawers or sitting on this stupid little footstool with my knees under my chin for 2 hours doing the bottom 2. I didn't think much of it because I was in such an uncomfortable position but my back started to hurt. I just thought it was my everyday around 2:00 back ache but then I started to have pains in my stomach. I don't really know how to describe the pain, it's not really like period cramps but it feels like a leg cramp kinda all the way across my stomach. It was down low in my stomach but now it's up high like right under my boobs. It's kind of a shooting pain too, like it gets really sharp now and then and sometimes it's just in one spot and not my whole stomach. And it feels like my whole stomach is tight and it won't relax, even though now I'm at home with my feet up. I know I'm probably an idiot and it's nothing but I would like some input/advice about what the pains could be and if it's enough to warrant a call to my Dr.
Re: Pain & tightness in tummy?
Ive never heard of someone being gone so long for a loss in their family..
If you are really worried - I would call your dr.