I signed a non-compete with a company and then was let go within 8 weeks. Is that enforceable?

I am an outside sales rep. who has worked a specific industry for many years. I also
worked for other industries on occasion in a similar capacity as the economy challenged my ability to earn. Recently, I was hired
back in the primary industry with promises and future
opportunities that were open ended. My employer suddenly hired someone else and let me go on the same day within 8 weeks of employment. I must earn a living, and this is what I do. Can this employer sue me under those terms if I work in sales in the same industry? Thank you for your help. I am attempting to work on an independent level in a similar, if not same capacity while representing other businesses. However, not under their employ and I cannot afford any residual lawsuit.