Must one perform ghusl again if the intention was to remove janabah for two different instances, but it is not certain whether the intention included both instances, knowing that the intention was only heartfelt and the questioner is prone to obsessive doubts?

Masturbation is forbidden, and one must repent from it. Delaying ghusl (ritual bath) and abandoning prayer are among the greatest sins, and one must make up for the missed prayers. A single ghusl is sufficient to remove multiple ritual impurities, and there is no need to intend for each impurity separately, as impurities overlap, and all are removed by the removal of some. The cure for waswasah (whispers/obsessive thoughts) is to turn away from them and pay them no heed.