Do you understand phenomenalism?

The wikipedia artlicle on phemomenology is as good as any summary I have read. Your own understanding of such summaries unfortunately will depend largely on your familiarity with other philosophical movements against which phenomenology can be contrasted. In particular you need to consider "logical positivism" which via "behaviourism" deflated the contents of consciousness to epiphenomena of a complex material process. Alternately you might contrast that view with more recent developments of "structuralism".

A seminal quotation for me which makes phenomenology worth a look comes from the physicist Heisenberg

I think that phenomenalism and phenomenology differ in that the former argues that nothing exists but experience--a form of radical subjectivsm or idealism?) and the latter (Husserl) contends that we can know objective realities ("essences") by deriving them logically or intuitively (?) from sensual experience.