It’s always hard to try and make the switch from one discipline to another considering education, pay, experience, demand, etc.
My gut reaction would be to look into commercial furniture or exhibit design firms. Something like mashstudios.com/ where they create site-specific work environments. Based on your experience and education there might be an opportunity to work at a place like that without additional education.
Exhibit design firms also deal with interiors, product & branding and it’s fast paced. http://www.displaycraft.com/ in CT.
I’ll think about it some more. What do you dislike the most? Type of work, lack of upward mobility, pay?