Unusual symptoms, but BFN

Ladies, I'm sure some of you have experienced this, but I need to vent a little. I've had the craziest symptoms this past TWW, but BFN at 10 and 11 DPO. I'm fairly certain this is not my month.  Actually, almost 100% confident this isn't my month. So how can all these crazy unusual symptoms (many unique to pregnancy) be explained? Hoping it doesn't mean something more serious is going on. 
If you've experienced this, please chime in - I'm getting worried :(