multiplicity of troubles; troublesome abundance
Describes a situation where problems, tasks, or annoyances are so numerous that they become burdensome. Often used in formal or written contexts.
I am swamped with a multiplicity of troublesome administrative procedures.
I am at my wits' end dealing with an extreme abundance of complaints.
Compound of 煩 (trouble, worry) and 多 (many, numerous). The exact historical derivation is uncertain, but the word is formed from classical Chinese elements and used in formal Japanese.