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These issues are all unlikely to be related.
is usually bacterial / skin problem is viral / tongue coat may be normal from rapid turn over from wear and tear...
is a common consequence of ear infection.
Pain from the heart is in the centre of chest / related to effort / short episodes / constricting and so on. It is simple to exclude and it can be done in a few minutes - EKG and cardiac markers.. / Get them done and get yourself re-assured. It is better to see and be sure than sit and worry.
Wishing speedy recovery