Is ghusl obligatory upon waking from sleep to find dry yellow or white stains on clothing, knowing that these secretions are constantly discharged throughout the day, and are these stains considered maniyy (spermatic fluid) necessitating ghusl, especially for someone who suffers from waswasah (obsessive doubts)?

The religion of Islam is one of ease, and the questioner must disregard obsessive thoughts and not pay attention to them. Ghusl (ritual bath) is not obligatory except when one is certain of the emission of semen, which necessitates ghusl. However, if you doubt whether what was discharged is semen, madhi (pre-seminal fluid), or discharge, then ghusl is not obligatory. The discharges you experience are vaginal secretions (rutubat al-farj), which are pure, but they nullify wudu (ablution) according to the majority of scholars.