If you want to check for interactions between all the drugs you're taking (or might take), drugs.com has an
interaction checker you can use. Just enter all the drugs you're taking now plus the ones being recommended.
The flecainide, metoprolol and Eliquis are all fine. MANY people take that combination of drugs. Just be aware that almost any combination of drugs will show interactions using this tool, and that tends to unnecessarily alarm people. Even flecainide and metoprolol show a "moderate" interaction, but those two drugs are almost necessary together, so use caution in how you interpret the results.