Yikes, ditto what Korkscrew said. Your hair was absolutely beautiful before and will be again. From personal experience making drastic changes to hair color is almost always a crapshoot that is entirely dependent upon the expertise (or lack of) of the stylist.
ALWAYS do a consultation first, especially when your changing colors (black to anything else demands an expert). That color consultation really tells if the colorist knows exactly what they're doing.
I don't know if you have Mario Tricoci salons but they seperate colorists and hair stylists (you do one or the other not both). When I went from black to caramel blonde with their colorist, we did a consultation before booking the process app. The colorist spent about a 30mins talking w/me and gave recs. on what to do before the process app.
The end result was natural color and soft undamaged hair.
Hope you find a salon that does just that for your next process,...just please get the consultation first.