My wife is a certified professional coach. That's her side gig. She always says it's as worth as you are willing to put the effort in changing your situation. Coaches will not and cannot solve your problems, they just bring them to your awareness, give you the tools, then it's up to you to decide what to do. Either way is fine.

Also, I know a friend who was diagnosed with cancer, had chemotherapy etc. She hired a health coach too...