<human>: Can you provide a brief rundown of the text in within 3 sentences?

Help me out here Reddit.  I've been working out for about 3 years now (at least, that's how long I've been a member of my gym).  But just within this past year, I've noticed that after a hard workout, I start to experience flu-like symptoms the next day.  I ache all over, there's shivering, and sometimes diarrhea.  These symptoms last the entire next day and sometimes into the day after.

Before, I have never considered connecting the two (working out, flu-like symptoms).  I had always assumed I just had the flu.  I looked it up online, found this question in a surprising amount of forums and each time it's been dismissed as "Oh, you have the flu.  Did you go to bed with your hair wet?  Did you wipe down the machine before you used it?  Maybe you caught it from someone at the gym?" **But I don't think it's that simple.**  

The first time it happened to me was last summer, I swam for the first time that summer for about an hour, and as hard as I could.  The next day I thought the chlorine made me sick.  Then it happened a month later after I went running outside and pushed myself to go farther than I usually go.  After that it happened a few more times, especially when I started a new exercise, but it was winter and I assumed that I was getting sick all the time.  And then it happened yesterday after I did intervals on the treadmill (I pushed myself hard), and it's finally clicked in my brain to connect these two things together.  

I am a 30 year old female, pretty healthy overall, active enough, and haven't had any major health issues in the past.  I am going to call my doctor on Monday, but I fear that he's just going to say "Oh, you just have the flu."
<bot>: I get flu-like symptoms for two days after working out really hard, health forums think it's just the flu, I don't.