1st ~ are you sure that your Gear is Good ?
If so, I highly doubt it's the Masteron, I've never heard anything like this in Reference to Masteron.
My suggestion:
Go over every single thing that you did Previously before this Occurred.
Any Pre-Workout or any Supplement.
Also, any OTC meds or anything else.
Cause it sounds like some type of Drug Interaction..................................... JP
Post Edit:
I forgot.
Any Prescription Meds ?