There are a couple of things that might be going on here....you could be having some type of allergic reaction to something you have eaten, come in contact with (even in the air), or something you have touched then you touched your face. For this, you can take some over the counter Benedryl and see if this starts to relieve your symptoms. IF so, you can assume it is something you have come in contact with that you are allergic to. Other than that, Rosacea can cause similar symptoms because it is an inflammatory process.
It is often very difficult to find the actual cause to skin rashes/redness/etc because we breathe and touch so many things that we are unaware of. However, we can treat the symptoms and inflammation until it improves. The Benedryl is about all you can do at home.....if you go see a Dr, they can give you something like Celestone or Decadron via injection and it will probably take care of it all pretty fast. I would say if your symptoms do not drastically improve within a couple more days or gets worse, the injection may be your only option.
Hope this helps!
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You can most certainly use the Benadryl cream but in my drug database, I show no interactions between the Benadryl and the Flecainide, but you can certainly go ahead and take the advice of your Pharmacist. The Benadryl cream will certainly help and I saw on your 'already tried' section that you have used Avon's Anew cream...I don't know if you are still using this, but I would stop all cosmetics and creams until this gets cleared up.