Michigan fertility doctors?

I'm 44 years old I'm from Michigan and my fiance is 40 I already have two children that are grown up he is not the father to my grown children him and I started dating 5 years ago he has no children we've been trying to have a baby together for quite a few years now and nothing seems to work natural does anybody have any advice on fertility doctors in Michigan I mean I would travel to if it come to it I just don't have a million dollars to have a baby everything costs so much...

Any help would be appreciated experience what your story