I think I'm being irrational, but I'm freaking out over here!!

[fivefeetshort]

On top of being an emet, I've had tummy problems for awhile. I went back to my doctor last week and we're pretty sure I have IBS-C. Since seeing her, I feel relieved in a way, because I actually know what's going on now. I'm always afraid of going places because sometimes I'll get d* (sort of...it's not bad, just a lot of bathroom trips and awful cramping), but now I feel a bit better knowing that I only get it because of being c* so much of the time.

Anyway, so I've been talking about this with my sister, as I'm visiting her right now. I used to be terrified of eating and getting sick but now I'm not so bad, since then. I felt like I was jynxing myself when I said it...and sure enough, I call my mom this morning and she said she has a sv*!!!
Obviously, I'm freaking out a bit. But now it's even worse because tonight I have a front row ticket to see Bob Dylan and I've been sooo excited about that, I can't miss out on it! I'm so worried about getting sick.

My mom tried to reassure me by telling me not to worry because her legs hurt first...my legs ached a bit yesterday, and they are today...but my legs do at times because I tend to not drink as much water as I should. And I know now probably I'm making it worse by thinking about it. I haven't seen my mom since Saturday around 5-6PM. She thinks she got it Sunday from a relative when she held her hand in church, because I guess she had it. But still, I'm worried. I know my mom didn't expose me because she didn't get sick until yesterday. But I'm worried the same person exposed us both, or maybe I will catch it from someone/somewhere since then...just knowing that someone has it worries me a little more.

I'm trying to reassure myself, but I could use some help! It'll be 72 hrs this evening since I even last saw my mom, so if someone else did expose her, and I was also exposed, I'd have it by now, right? Also, she thinks her legs aching beforehand has something to do with it, but I've never heard of that? I know your legs can hurt during/after because of dehydration, but should I worry that my legs are aching now? :/
Please help! I really want to enjoy tonight and not be worrying about it!!!

edit/update: I just talked to my mom again. She said she's had a fever, and achy legs, and no appetite. She's only had d*, and it was all day yesterday and today. I asked if she's v* and she said no, but she hasn't been eating either. I asked her how she knew that our relative was sick and she said that my cousin had told her...but she said she started to have no appetite Sunday, which was the day she held the relative's hand in church, so I don't think she would have caught it from her? Is it possible that she could have gotten this from an insulin shot, does anyone know? She recently started having to take insulin, and she said the other night she hit a bad part in her leg and it bled a lot and she got a little bump there...so she thinks maybe it might be an infection? Could that be a possibility? Usually with a bug even though she says she isn't eating, usually you're dry-heaving at least, right?
She got kind of upset and told me she didn't think I'd freak out and that I needed to stop because I was going to make myself sick, which I know and obviously I am trying to forget about it, but as we all know it's hard and instead I'm just sitting here crying. She said as long as I have an appetite I'll be fine. I had an appetite yesterday, and I did eat breakfast before I talked to her, but obviously now I don't really feel like eating...ugh.
In any case, I should be okay, right? I just wish I knew what exactly this was, maybe it's not even a bug...