As always, the answer depends on many factors. Did you sign a non-compete? Does it include client non-solicitation language? Are the new job...

Will a company settle and give me a nice settlement if I threaten to sue?

The terms "wrongful termination" and "hostile work environment" are thrown around loosely these days. It's impossible to tell based on your post...

Can an employer require you to work in a management position if you were not hired to do so?

You may very well have a disability entitling you to accommodation but that depends on many factors which are beyond the scope of this forum. That...