In my city that is fairly large (about a million people), a 150 page book at a standard 250 or 300 words per page by a ghost writer would run at least $5,000 and 300 pages might cost double or more, or $10,000 to $12,000.
Editing by a professional editor here after you wrote it would be $10 per page or more and that's for proofreading and minor grammatical/punctuation changes. If a "substantive edit" is needed, which includes changes in sentence structure, paragraph placement, use of language as in appropriate reading grade level, and other items, then edits can cost $50/page or a bit more. It's pretty expensive.
If you have any Literary Agents in your city, call and ask if they can suggest a lower-cost ghost writer and/or editor. Some of these go into semi-retirement and charge a bit lower fees. An agent can help you with suggestions about content and style - tens of thousands of books about child and adult abuse, recovery, and healing (from your profile) suggests that you may need to have some style that will stand out from among the rest. You may already have that style or special story.