I feel lost now that Baba is no longer in his physical form. Is he still present and helping his devotees?

Yes, absolutely. Chapter 43 provides great reassurance on this matter. It explains that when Sai Samarth left his body, he did not perish but instead merged into the unmanifest, attaining his previous true state. The text states he now resides in the hearts of his devotees and always keeps them awake. He has become one with Brahman and, in his true form, fills the entire moving and non-moving world. Chapter 43 assures us that by merely remembering his name, he remains present and his influence is proven, providing the same experience based on the feeling in a devotee's mind.